Sims Genes

[jessiethedog]

The rate at which weight is gained for my one sim is different to the rest. Her mother was rather large (I would guess almost at the right hand side of the slider in CAS) yet she was one of the skinniest sims I ever saw. I cannot remember her father. However, when she ate one single meal too many, her weight increased drastically-I will try and find pictures. Free will was off, as it is in most of my games, so she couldn't have eaten anything else. Does anyone have an ideas if it was the mother's genes that caused this, or just a glitch?

I tend to find that blue eyes are passed down through the generations on my game-even though I believe it is a recessive gene in real life.

[samoht04]

I think the townie would have had to have been a firefighter to get the arson trait.

It's Pyromaniac.  Shame he fires go out in my opinion, kind of cool for effect though.

I tend to find that blue eyes are passed down through the generations on my game-even though I believe it is a recessive gene in real life.

Brown is the dominant Eye Colour I think but Blue is quite common is real life as well I think. Guess I am lucky to have 2/3 of my Jades have Green eyes then! I have also been getting a lot of Dark haired sims from Blonde Parents lately, one hair colour came from a Great-Grandparent, ah Sims Genes work in mysterious ways.

You probably won't believe this but Rabbit Character without working out gets a bit tubby, I think it was from Star who was very large before I put her in the Body Sculptor. The Butler doesn't help your sims keep slim either, so if you want Sims to put on weight just hire a butler! 

[Janna]

I am reviving this for two reasons, one is the weight aspect of sims and being passed on, other skin color.

My sim, second generation (took after dad, cop, nice body  ), married a townie who was on the chubby side.  With watching when she ate and exercising she lost weight.  After having a baby, she put the weight back on (been there, done that).  Again, was able to get her to lose weight, second babies (twins), same thing.  Lose weight-again. Hubby was athletic, always working out, he kept that nice hot bod like his dad had. 

First born has nice slender body, just right size.  The twins, at child were slender, but at teen, one stayed slender other went to chubby like her mom. She had the athletic skill, she had always been working out on her own. Yet at YA, the one stayed slender  and the other went to seriously overweight.   
Went through several aspects, dieting and exercise, changing the slider bar, the body shaper, dieting, changing the slider bars, no matter what, they both returned to the original weight. 
Makes me wonder how much is genetics, how much it is programed that they stay at the weight they originally had, no matter how much dieting, exercising or other, they will not become slender.   


Now, the skin question.  Aliens have naturally green skin.  Offspring has green skin, although not as green.  Her offspring also has less green but it still has a greenish cast to it.  Is that a genetic aspect, and it will get lighter with each offspring?  Could there be a throwback, one who would have the greener skin?
I've never done a green or any skin color different than a normal type, some variations due to race, but within what is normal ranges.  In CAS you can change the skin colors, does that pass on to next generations?

I am figuring from a family that I have that is now at fourth generation; that the skin colors and blending of the colors of ancestors can be passed on to their decendants, adding any new skin and hair colors as they are added. 

[Ricalynn]

The way Sim Genetics work is that there is a possibility of a child being on the skintone slider of it's parents or it's grandparents.  But it's location on the skin slider is also random based on it's parents. It can be anywhere between the two points that the parents rest on their sliders.  For a great example of this, there is a thread on rainboos (children born on rainbow sliders) that shows this as part of the genetics.   The actual genetics of a Sims 3 child is very straightforward except for when it comes to aliens.   Alien powers are passed down but decrease over time.   The skin tone, face shape, head shape, eyes and ears can all passed down without a child actually receiving the ability to do any of the alien fun stuff. 

As for the weight, it becomes a part of them and it's a part of their coding.  Nothing in the game says that dieting will keep them from gaining the weight back.  If you want a larger Sim to stay slim, they have to do exactly as a real person would, workout.   I had a chubby person in my dynasty and he ran for a few hours every day to maintain a smaller size but because his mom had the random fat gene, it was destined to be chubby if I didn't make him work out. 

This is the actual game information that it uses for genetics. 

Code: [Select]

<kSkinColorMaxPercentTravel value="50">
      <!--When choosing skin color, max pct change in parent skin tone.  Valid range [0, 100].-->
    </kSkinColorMaxPercentTravel>
    <kMoodLevelNegative value="-25">
      <!--Pregnancy mood level tuning.  Valid range [-100, 100].-->
    </kMoodLevelNegative>
    <kMoodLevelNeutral value="0">
      <!--Pregnancy mood level tuning.  Valid range [-100, 100].-->
    </kMoodLevelNeutral>
    <kMoodLevelPositive value="70">
      <!--Pregnancy mood level tuning.  Valid range [-100, 100].-->
    </kMoodLevelPositive>
    <kMoodLevelVeryPositive value="120">
      <!--Pregnancy mood level tuning.  Valid range [-100, 100].-->
    </kMoodLevelVeryPositive>
    <kInheritGrandparentTrait value="25">
      <!--Chance to inherit traits from grandparent.  Valid range [0, 100].-->
    </kInheritGrandparentTrait>
    <kInheritParentTrait value="40">
      <!--Chance to inherit traits from parent.  Valid range [0, 100].-->
    </kInheritParentTrait>
    <kInheritBodyShapeShiftAmount value="0.2">
      <!--Max amount to shift around inherited bodyshape.  Valid range [0, 1].-->
    </kInheritBodyShapeShiftAmount>
    <kMutateHairColorChance value="20">
      <!--Chance for mutation when inheriting hair color.  Valid range [0, 100].-->
    </kMutateHairColorChance>
    <kHairColorChooseGrandparentChance value="50">
      <!--When choosing wing color, chance of selecting a grandparent.  Valid range [0, 100].-->
    </kHairColorChooseGrandparentChance>
    <kMutateEyeColorChance value="10">
      <!--Chance for mutation when inheriting eye color.  Valid range [0, 100].-->
    </kMutateEyeColorChance>
    <kEyeColorChooseGrandparentChance value="50">
      <!--When choosing eye color, chance of selecting a grandparent.  Valid range [0, 100].-->
    </kEyeColorChooseGrandparentChance>
    <kMutateHairStyleChance value="90">
      <!--Chance for mutation when inheriting hair style.  Valid range [0, 100].-->
    </kMutateHairStyleChance>
    <kCelebrityLevelPercentage value="0.6,0.8">
      <!--Range: Percentage of the Max Celebrity level of the parents applied to the children.  Valid range [0, 1].-->
    </kCelebrityLevelPercentage>
    <kHaveCelebrityKidChance value="0.5">
      <!--Chance for getting celebrity level for two npc celebrity parents.  Valid range [0, 1].-->
    </kHaveCelebrityKidChance>
    <kInheritDadBodyHairStyleChance value="40">
      <!--Chance of inheriting Dad's body hair.  Valid range [0, 100].-->
    </kInheritDadBodyHairStyleChance>
    <kInheritMomHiddenBodyHairStyleChance value="40">
      <!--Chance of inheriting Mom's hidden body hair.  Valid range [0, 100].-->
    </kInheritMomHiddenBodyHairStyleChance>
    <kMutateWingChance value="10">
      <!--Chance for mutation when inheriting wing color.  Valid range [0, 100].-->
    </kMutateWingChance>
    <kWingShapeChooseGrandparentChance value="25">
      <!--When choosing hair color, chance of selecting a grandparent.  Valid range [0, 100].-->
    </kWingShapeChooseGrandparentChance>
    <kWingColorChooseGrandparentChance value="25">
      <!--When choosing hair color, chance of selecting a grandparent.  Valid range [0, 100].-->
    </kWingColorChooseGrandparentChance>
    <kAlienHeadWide value="1, 1">
      <!--Alien Facial Blend: HeadWide (First entry female, second male)-->
    </kAlienHeadWide>
    <kAlienJawChinSquare value="0.46, 0">
      <!--Alien Facial Blend: JawChinSquare (First entry female, second male)-->
    </kAlienJawChinSquare>
    <kAlienNoseScaleDown value="0.25, 0.57">
      <!--Alien Facial Blend: NoseScaleDown  (First entry female, second male)-->
    </kAlienNoseScaleDown>
    <kAlienNoseDown value="0.01, 0.01">
      <!--Alien Facial Blend: NoseDown  (First entry female, second male)-->
    </kAlienNoseDown>
    <kAlienNoseThin value="0.5, 1">
      <!--Alien Facial Blend: NoseThin  (First entry female, second male)-->
    </kAlienNoseThin>
    <kAlienNoseBridgeRotate value="0.33, 1">
      <!--Alien Facial Blend: NoseBridgeRotate   (First entry female, second male)-->
    </kAlienNoseBridgeRotate>
    <kAlienNoseBridgeOut value="0.33, 0.73">
      <!--Alien Facial Blend: NoseBridgeOut (First entry female, second male)-->
    </kAlienNoseBridgeOut>
    <kAlienNoseBridgeScaleUp value="0.5, 0.5">
      <!--Alien Facial Blend: NoseBridgeScaleUp (First entry female, second male)-->
    </kAlienNoseBridgeScaleUp>
    <kAlienNoseNostrilsUp value="0.5, 0.5">
      <!--Alien Facial Blend: NoseNostrilsUp (First entry female, second male)-->
    </kAlienNoseNostrilsUp>
    <kAlienNoseNostrilScale value="-1, -1">
      <!--Alien Facial Blend: NoseNostrilScale (First entry female, second male)-->
    </kAlienNoseNostrilScale>
    <kAlienNoseTipScaleDown value="1, 1">
      <!--Alien Facial Blend: NoseTipScaleDown (First entry female, second male)-->
    </kAlienNoseTipScaleDown>
    <kAlienEyesBrowCurve value="0.29, 0.29">
      <!--Alien Facial Blend: EyesBrowCurve (First entry female, second male)-->
    </kAlienEyesBrowCurve>
    <kAlienEyesBrowRotate value="0.75, 0.75">
      <!--Alien Facial Blend: EyesBrowRotate (First entry female, second male)-->
    </kAlienEyesBrowRotate>
    <kAlienMouthLipUpperDefinition value="0.25, 0.25">
      <!--Alien Facial Blend: MouthLipUpperDefinition (First entry female, second male)-->
    </kAlienMouthLipUpperDefinition>
    <kAlienMouthCurveDown value="0.5, 0.5">
      <!--Alien Facial Blend: MouthCurveDown (First entry female, second male)-->
    </kAlienMouthCurveDown>
    <kAlienMouthIn value="0.5, 1">
      <!--Alien Facial Blend: MouthIn (First entry female, second male)-->
    </kAlienMouthIn>
    <kAlienTranslateMouthDown value="0.75, 1">
      <!--Alien Facial Blend: TranslateMouthDown (First entry female, second male)-->
    </kAlienTranslateMouthDown>
    <kAlienMouthThin value="0.5, 0.5">
      <!--Alien Facial Blend: MouthThin (First entry female, second male)-->
    </kAlienMouthThin>
    <kAlienEyeAlienCorrector value="1, 1">
      <!--Alien Facial Blend: EyeAlienCorrector (First entry female, second male)-->
    </kAlienEyeAlienCorrector>
    <kAlienEyeAlien value="1, 1">
      <!--Alien Facial Blend: EyeAlien (First entry female, second male)-->
    </kAlienEyeAlien>
    <kAlienJawChinDown value="0.5, 0.75">
      <!--Alien Facial Blend: JawChinDown (First entry female, second male)-->
    </kAlienJawChinDown>
    <kAlienJawChinScaleDown value="0.33, 0.33">
      <!--Alien Facial Blend: JawChinScaleDown  (First entry female, second male)-->
    </kAlienJawChinScaleDown>
    <kAlienJawThin value="1, 1">
      <!--Alien Facial Blend: JawThin   (First entry female, second male)-->
    </kAlienJawThin>
    <kAlienJawCheeksIn value="0.6, 0.6">
      <!--Alien Facial Blend: JawCheeksIn    (First entry female, second male)-->
    </kAlienJawCheeksIn>
    <kAlienJawCheekSharpness value="0.45, 0.45">
      <!--Alien Facial Blend: JawCheekSharpness (First entry female, second male)-->
    </kAlienJawCheekSharpness>
    <kAlienEarsRotateY value="0.5, 0.5">
      <!--Alien Facial Blend: EarsRotateY  (First entry female, second male)-->
    </kAlienEarsRotateY>
    <kAlienEarPoint value="1, 1">
      <!--Alien Facial Blend: EarPoint   (First entry female, second male)-->
    </kAlienEarPoint>
    <kAlienHeadProfileOut value="1, 1">
      <!--Alien Facial Blend: HeadProfileOut (First entry female, second male)-->
    </kAlienHeadProfileOut>
    <kAlienEyesLashesThin value="1, 1">
      <!--Alien Facial Blend: EyesLashesThin (First entry female, second male)-->
    </kAlienEyesLashesThin>
    <kAlienJawCheeksBoneDown value="0.1, 0.1">
      <!--Alien Facial Blend: JawCheeksBoneDown  (First entry female, second male)-->
    </kAlienJawCheeksBoneDown>
    <kAlienJawChinRound value="0, 0.1">
      <!--Alien Facial Blend: JawChinRound (First entry female, second male)-->
    </kAlienJawChinRound>
    <kAlienNoseTipDepthIn value="0, 0.45">
      <!--Alien Facial Blend: NoseTipDepthIn (First entry female, second male)-->
    </kAlienNoseTipDepthIn>
  </Current_Tuning>
  <Deprecated_Tuning>
    <kMutateHairColorChooseParentBlendChance value="10">
      <!--When hair color mutates, chance for parent blend color.  Valid range [0, 100].-->
      <!--deprecated on: 4/15/2008 4:25:06 PM-->
    </kMutateHairColorChooseParentBlendChance>
    <kMutateHairColorChooseFullBlendChance value="2">
      <!--When hair color mutates, chance for full spectrum blend color.  Valid range [0, 100].-->
      <!--deprecated on: 4/15/2008 4:25:06 PM-->
    </kMutateHairColorChooseFullBlendChance>


[TheTripWasInfraGreen]

Since this thread is now active again, I can say that I'm very skeptical that weight is inherited based on the parents' weight at conception. I think it's based off when they're born.

During my fifth attempt with the Graves, Journeyman was normally very averagely built (like, right smack in the middle of the weight slider) and Julienne was always very slender. They were just that way when Willow was conceived, but when Willow was born, Journeyman was close to maximum fatness due to his surprise alien pregnancy. Let's just say that Willow had to do plenty of cardio workouts to keep herself in reasonable shape.

It's actually facial features that mystify me the most. I know that it's apparently down to a 50/50 chance, but I often doubt whether it's just blind luck. I'm also disappointed that they can't skip a generation. I'd enjoy the randomness of a kid randomly getting his grandpa's nose.

[Dextra2]

Does anyone know how to guess which hair coulor will be inhairated? Like is children more likly to get blond hair instead of brown?

[TheTripWasInfraGreen]

It isn't based on the colors. The mom and dad have an even chance of passing their color down (I think it's 40 or 45% each). The remainder is either grabbed from a grandparent or a random color from the bin (including the hidden and fully dreaded green-brown hair).

[Janna]

Quote from TheTripWasInfraGreen;

"Since this thread is now active again, I can say that I'm very skeptical that weight is inherited based on the parents' weight at conception. I think it's based off when they're born."

Alexandra's pregnancies don't match up to your theory.  She was chubby when they married.  She was his highschool sweetheart and before I let her get pregnant I had her get in shape.  She exercised daily, I controlled when she ate and she lost to what I see as a nice size, slightly below the middle.  Had her that way for a week before I let her become pregnant.  While pregnant she was still exercising and watching when she ate. Didn't let it go to yellow, but it had to be low.  Gave birth and still at a good size.  I didn't have her go back to the exercising until I realized she had put weight back on.  This was after giving birth.
Lost it all, back to being in good shape; pregnant again, same aspect, exercise, eating as with previous pregnancy; birth, still nice size. 
Week later, still watching when she ate but no exercising and back goes the weight.
The twins, they are both slender as toddlers and as children.  But at teen one aged up to being quite chunky, and she had the athletic trait and even with exercise she still kept the weight on.  Her twin was as slender as her dad and grandparents (g-mother I created, g-father was a townie - George Dean). 

If I go at conception, she was slender then; she had lost weight to be at nice size.  Same with second pregnancy; Slender before and just after birth, started to put weight on a couple days later.  Her parents were both chubby, and she had two sisters, one was chubby and one was slender. 
Overweight daughter I could keep at chubby, she went into law enforcement and her grandfather, mother's side, was her boss and he was still chubby.

I'm not trying to be argrumentive, but if I go with your theory, at conception the twin who was quite chubby should have been slender.  Mother was slender before, during and after pregnancy.  But a couple of days later started to put weight back on. She took after her mother's side of the family, overweight. 

[Pam]

Dieting doesn't really do anything with a Sim's weight.  It's the exercise that changes the body.  So, if they're not working out, they will gain weight no matter what they eat.

[bubbles]

Dieting doesn't really do anything with a Sim's weight.  It's the exercise that changes the body.  So, if they're not working out, they will gain weight no matter what they eat.

My sims only gain weight if they over eat, even if they never exercise. However, they never lose weight by under eating.

Can traits get passed down if the mother can't choose the traits of a baby? For example, an athletic parent has an athletic Nooboo.

[Castaras]

Don't think so. Believe that traits when rolled randomly are rolled randomly, off two "charts" of good and bad traits, depending on how the pregnancy went. Would be interesting to see what the good and bad "charts" include though, if this is the case...

[Pam]

Can traits get passed down if the mother can't choose the traits of a baby? For example, an athletic parent has an athletic Nooboo.

No.  If you don't choose the baby's traits, the game rolls random traits.  I don't believe it rolls from "good" and "bad" charts, either.  Traits are just traits and the game randomly assigns them.

[Zyffyr]

Don't think so. Believe that traits when rolled randomly are rolled randomly, off two "charts" of good and bad traits, depending on how the pregnancy went. Would be interesting to see what the good and bad "charts" include though, if this is the case...

Nope, no separate charts. The results are no different that you hitting the dice button for random traits.

[NearlyWitches]

I thought if the mother had a bad pregnancy then the nooboo would be more likely to get negative traits. Is it random for all life stages then?

[smartburn]

Maybe I haven't played with enough babies. The few times that I couldn't choose one of the traits (I've never been assigned both), I always get something "good" like genius or loves the outdoors. I try to keep mom as happy as reasonably possible, though since I usually try for baby early in a game where I want children, I don't always have the LTRs or money to make it absolutely perfect.

It's actually facial features that mystify me the most. I know that it's apparently down to a 50/50 chance, but I often doubt whether it's just blind luck. I'm also disappointed that they can't skip a generation. I'd enjoy the randomness of a kid randomly getting his grandpa's nose.

Yeah - I'm glad that eyes can pass down from the grandparents, but facial features would be nice. What would be really nice is if beauty marks and freckles were passed down as well.