Question

This is a genotype with one dominant allele and one recessive allele:

A) Homozygous dominant
B) Homozygous recessive
C) Heterozygous
D) Codominant

Answer 1

A genotype with one dominant allele and one recessive allele is called Heterozygous. It is different from homozygous dominant or recessive, and codominant genotypes.

Step-by-step explanation:

A genotype with one dominant allele and one recessive allele is referred to as C) Heterozygous. This is because the individual has one copy of the dominant gene and one copy of the recessive gene (Aa), manifesting the dominant trait in their phenotype. In contrast, a homozygous dominant genotype is when there are two dominant alleles (AA), and a homozygous recessive genotype consists of two recessive alleles (aa). Codominant refers to the expression of both alleles independently in the phenotype, as seen in the ABO blood group system with genotypes such as AB.