Why can't polar bears survive on berries or eggs?

In a relatively small iguana population the allelic frequency is tracked for three generations. webbing is a recessive allele; no webbing is the dominant allele. during one very rainy spring and summer, a flood washes all the iguana without webbed feet out to sea. by the fall, and three generations later, you have the gene pool seen here.

What does all of the organ system in a human form

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is