Question

Help is needed

Answer 1

In a group of rats, some individuals have a normal-sized body and others have a dwarf body. In this group, the gene for the body size trait has two alleles. The allele for a dwarf body (b) is recessive to the allele for a normal-sized body (B).

Scooter is a rat from this group. Scooter has the heterozygous genotype Bb for the body size gene.

Based on this information, what is Scooter's phenotype for the body size trait?


A normal-sized body

A dwarf-sized body

Aa

AA

Answer 2

Scooter's phenotype for the body size trait is a normal-sized body. Even though Scooter has one allele for dwarf body size (b), the presence of one dominant allele for normal body size (B) is enough to express the normal-sized body phenotype.