Question

in a punnett square, a lower case letter stands for a ______________ allele. heterozygous dominant recessive homozygous

Explanation:

In genetics, when using Punnett squares, it is a standard convention that lower - case letters represent recessive alleles. Recessive alleles are only expressed in the phenotype when an organism has two copies of the recessive allele (homozygous recessive). In contrast, dominant alleles (represented by upper - case letters) are expressed even when only one copy is present.
"Heterozygous" refers to having two different alleles (e.g., \(Aa\)), and "homozygous" refers to having two of the same alleles (either \(AA\) or \(aa\)), but these terms are not related to the case (upper or lower) of the letter used to represent the allele.

Answer:

C. recessive