An organism with two identical alleles for a given trait is

The crossing of a homozygous tall plant with a dwarf in $F2$ would yield plants in the ratio of

Organisms phenotypically similar but genotypically different are said to be

In pea hybrids between red flowered and white flowered strains were crossed back to pure red flowered strain. The progeny of this cross will have

Some pure black mice were mistakenly mixed with hybrid black mice. The quickest way to discover whether one individual black mouse is pure is