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 only. Mice with this traitare called waltzing mice (r). Hair color is also inherited in mice. Black hair (B) is dominant over brown hair (b).For each of the following problems, determine the parent genotypes,determine possible gametes then construct a Punnet square to solve:

Cross a heterozygous running, heterozygous black mouse with a homozygous running, homozygous black mouse.

Parental Genotypes: _

Phenotype of offspring: _

All offspring mice will be running mice and will have black hair because all the four types of genotype at least have one dominant allele for both the genes.

nishantwork777 nishantwork777 · Answer 2 · 2021-11-25T06:31:06+01:00

The genotype of the parents is RB, Rb, rB, and rb. The phenotype of the offspring is Normal running Black mice.

Dihybrid Cross:

This cross is performed between the 2 parents for 2 traits at the same time.

For example, the running ability and coat color of the mice.

In the given case, the

Given here,

The heterozygous running, heterozygous black mouse crosses with a pure breed running, pure breed black mouse.

The cross RrBb x RRBB

The genotypes of the parents,

P1 - RB, Rb, rB, rb

P2 - RB

The genotype of the offspring,

RBRB, RBRb, RBrB, and RBrb

All offspring have RB genotype. Hence, all will be Running Black mice.

Therefore, the genotype of the parents is RB, Rb, rB, and rb. The phenotype of the offspring is Normal running black mice.

To know more about dihybrid cross,

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