Question

1-In mice, the ability to run normally is a dominant trait. Mice with this trait are called running mice (R). The recessive trait causes mice to run in circles and we call these waltzing mice (r). Hair color is also inherited. Black hair (B) is dominant over brown hair (b).

If a mouse is h0m0zygous running and heter0zygous for hair color, its genotype is
______.

Answer 1

The genotype of the mouse is homozygous running (RR) and heterozygous for hair color (Bb).

Step-by-step explanation:

1. Running (R/r):

Homozygous: This means the mouse has two copies of the same allele.

Dominant allele: R

Genotype: RR

2. Hair color (B/b):

Heterozygous: This means the mouse has two different alleles.

Dominant allele: B

Recessive allele: b

Genotype: Bb

Combining the information:

To determine the combined genotype, we simply combine the genotypes for each trait:

Genotype (running + hair color): RR + Bb = RRBb

Therefore, the combined genotype of a mouse that is homozygous running and heterozygous for hair color is RRBb.