Question

assume a phenotype is determined by one gene with a dominant allele and a recessive allele. if one parent is homozygous dominant (aa) and the other parent is homozygous recessive (aa), what genotype(s) might their offspring have?
○ aa, aa
○ aa
○ aa, aa
○ aa, aa
○ aa, aa, aa

Explanation:

Step1: Determine gametes

Parent 1 (AA) can only produce A gametes. Parent 2 (aa) can only produce a gametes.

Step2: Use Punnett square

$$\begin{array}{|c|c|} \hline & A \\ \hline a & Aa \\ \hline \end{array}$$

All offspring will have the genotype Aa.

Answer:

B. Aa