An organism with two identical alleles for a given trait is:

How many pairs of contrasting characters in pea plants were chosen by Mendel for his experiments?

$A$ cross between an $F_1$ plant and a recessive parent is called:

When a true breeding pea plant that has yellow seeds is pollinated by a plant that has green seeds,all the $F_1$ plants have yellow seeds. This means that the allele for yellow is

$A$ factor (allele) is dominant if it is expressed in ...............

Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called