Question

explain how a trait might seem to disappear for a generation and then reappear in the following generation

Answer 1

if u know the basics of genetics it will be easy to understand.
any gene is represent by two alleles. it can be either dominant or recessive.
we have dominant and recessive alleles
dominant alleles are expressed only when it is in homozygous as well as in heterozygous condition.
whereas recessive alleles are expressed only during homozygous condition.
consider the genes for colour