Why are some recessive traits more common than dominant ones? I'm specifically talking about hairlines. Let's say straight is dominant and Widows Peak is recessive. Can anyone explain to me how it's possible that Widows Peak (recessive) could become more common than the straight hairline (dominant)?

Question

abb0t · Answer

Think of epistasis, plietropy, overdominance...there's a few more but I forgot. Also, it depends on the genes in the person, if one person is a carrier for recessive, mates with someone who is homozygous recessive for another, higher chances occur for their child. Doest that makes sense?

anonymous · Answer

I think I figured it out already. The lesson I had did not talk about epistasis, plietropy, or overdominance but I know that they're still part of biology. I don't think it's in the curriculum for biology I on FLVS. 

What I put for the answer was: 

"It's possible for recessive traits to become more common than dominant traits in their offspring if one parent has two recessive alleles (ex. "oo") and another parent has Oo or even another oo." 

What you said about homozygous recessive helped me out a lot. Thanks!