Which term refers to a type of trait that is usually expressed only when an organism has two identical alleles for the trait?

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Animals such as pronghorn antelope, bison ans badgers dot to the landscape. where are these animals located?

How does an angiosperm prevent self pollination