Question

which genotype is homozygous? select all that apply.
a dd
b dd
c dd
d dd

Explanation:

A homozygous genotype has two identical alleles. In option A (DD), both alleles are the same (dominant). In option B (dd), both alleles are the same (recessive). Options C (Dd) and D (dD) have different alleles (one dominant and one recessive), so they are heterozygous.

Answer:

A. DD, B. dd