Question

an organism has one dominant allele and one recessive allele for a trait (bb). what is its genotype called?
homzygous recessive
homozygous dominant
heterozygous
phenotype

Explanation:

A genotype with one dominant and one recessive allele (Bb) is defined as having two different alleles for a trait, which matches the definition of heterozygous.

Answer:

Heterozygous