Correcting the DNA of Strangetown premade characters
baratron:
Quote from: questar on 2006 January 01, 15:52:23
Also, I don't get why you say that Alien skin is dominant. Why would that be the case? If an Alien were to inseminate some unfortunate human, I would think that its genes would ALL be recessive since they are reproducing in a foreign, if not hostile environment and under artificial circumstances. I'm thinking that the alien genes would be at a disavantage, hence recessive. If you know something about why alien skin is dominanat then tell on.
Because "dominant" is the way Maxis wrote it in the Sims 2 code ::). Maybe it doesn't make logical sense, but nor do light blue eyes in dark-skinned people.
IgnorantBliss:
For some strange Maxian reason, the alien skintone is only dominant when one parent is homozygous to it. That's why babies born from abductions are always green (excluding custom skintones). However, when a parent has only one green skintone gene and one "regular" Maxis skintone gene, the green skintone turns equal with the other ones. Therefore if one parent's genes are green/regular and another parent's regular/regular, each one of their children has a 25% chance of expressing the green skintone (another 25% will have the green skintone in their DNA but they are expressing another).
By the way, to answer a question posted earlier in this thread, if a sim inherits two recessive eye color genes, like grey and green, for example, he can express either one of them, with a 50/50 chance. The same applies to all the other hair or eye colors that are equally recessive or dominant. Also, if you create a child in CAS out of two parents, then their DNA will be mixed accordingly, which is nice, and they won't be homozygous to their genes like their parents.
And thanks for this great tutorial, this has been of great help in restarting my neighborhoods :).
cwykes:
Please can someone take a minute and tell me how skintone is determined when 2 parents have differet skintones - ignoring alien skin completely. Suppose you marry two sims with skintones S1 and S4 who are both homozygous. We know it's not a 50-50 chance of either S1 or S4, but is there an equal chance of getting S1, S2, S3 and S4 skin or is it more complicated than that? If the two sims were S1 and S3, how do the odds work then and can a kid end up as S4?
RainbowTigress:
Since there are no dominant skintones in the S1-S4 tones, the child will express a random skintone anywhere between the two skintones received from the parents. So if one parent is S1 and the other is S4, then the child can be any skintone: S1, S2, S3, or S4. In my first run of Pleasantview, Lilith (S1) and Dirk (S4) had 4 children. The first two were twins (S4 and S3) and the last two were both S3.
LadyDragonair:
Quote from: rainbow on 2006 January 04, 20:26:00
Since there are no dominant skintones in the S1-S4 tones, the child will express a random skintone anywhere between the two skintones received from the parents. So if one parent is S1 and the other is S4, then the child can be any skintone: S1, S2, S3, or S4. In my first run of Pleasantview, Lilith (S1) and Dirk (S4) had 4 children. The first two were twins (S4 and S3) and the last two were both S3.
That is exactly right although when they have kids they will only pass on s1 or s4 even though they express s3. All the kids Lilith and Dirk had were s3 in my game but passed on s1 and s4.
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