Question

pea plants have either purple or white foowers, where purple is dominant. what cross would guarantee the offspring plants only have white flowers?

one parent is homozygous dominant, and one would be homozygous recessive

both parents would be homozygous dominant

both parents would be homozygous recessive

both parents would be heterozygous

Answer 1

To guarantee that the offspring plants only have white flowers, you would need to have one parent that is homozygous recessive (white flowers) and one parent that is homozygous dominant (purple flowers). However, since purple is dominant, if the homozygous dominant parent is involved, there will be no white flower offspring.

The correct cross that guarantees all offspring have white flowers is:

**Both parents would be homozygous recessive** (both would have the genotype 'pp').

This would result in 100% 'pp' offspring, all expressing the white flower phenotype.

So, the answer to your question is:

**Both parents would be homozygous recessive.**