how many generations can recessive genes go back?

Question

I have green eyes no one else in my family does , i heard people talk about recessive genes how far can they go back because no one from me to my great great great grandfather has green eyes

Answer 1

don't know:)

Answer 2

Hundreds of generations. That is the whole point of recessives. If one parent has a recessive gene for green eyes, their eyes will be the dominant gene, say brown. If the other parent has two dominant genes, say also brown. Then on average, 1 in 4 of their children will carry the recessive and none will show it. That can continue for generation after generation until one of the kids with the recessive marries another with the recessive and then on average, 3 out of 4 kids will carry the recessive and 1 will not and 1 in 4 will have green eyes - and be burned for witchcraft. No, we don't do that any more.

Answer 3

Really it depends on the gene. If there is some selective pressure forcing it out of Hardy Weinberg equillibrium. For example lets say the blue eyed people can see better in the dark. Then you would see more and more blue eyed people until eventually green would be gone (this is hypothetical).

Answer 4

ok lets say a is a recessive trait and A is a dominant trait, a person that is AA or Aa has the dominant trait and a person that has aa has the recessive trait, so your family can all be like Aa for a bunch of generations and now you're aa...but for eye color its not that simple cause theres more than one type of eye color its not like being able to roll your tongue (which btw is a dominant trait)

Answer 5

Recessive genes can go back hidden, potentially forever. It's random if they get passed on, but there is no "expiration" to genes: they either get passed on or they don't.

Answer 6

commencing with a real breeding pair (ie. homozygous recessive and homozygous dominant), your first technology of offspring would be a hundred% heterozygous. that's barely in the 2nd technology once you combine the hetero. in case you draw out your Punnett sq. utilising the two hetero mothers and fathers, you will see that 25% of your offspring are homo. recessive.