If for peas, a round shape is the dominant allele (A), and a wrinkly shape is the recessive allele (a), what is the genotype of a round pea?

Question

Quizplus · Accepted Answer

For every trait expressed in a sexually reproducing organism, there are at least two alternative versions of a gene, called alleles. In this question, there are two alleles: the dominant allele for pea shape (round) and the recessive allele for pea shape (wrinkly).
A genotype is the combination of alleles. It is the genetic makeup of an individual organism. An individual's genotype functions as a set of instructions for the growth and development of its body. A phenotype represents the traits that will be expressed.
In this question, a pea's genotype and phenotype could be:
Dominant homozygous - AA - pea will be round
Recessive homozygous - aa - pea will be wrinkly
Dominant heterozygous - Aa - pea will be round
In our case, since the round shape is dominant, it will be visually present in both homozygous and heterozygous individuals who have the dominant allele (AA or Aa).

If for Peas, a Round Shape Is the Dominant Allele