2) 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 trait are 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 Punnett square to solve.
a. Cross a heterozygous running, heterozygous black mouse with a homozygous running,
homozygous black mouse.
Parent's Genotypes:
BERR
(BB) KR
Gametes:
List phenotypes with ratios:
Bb D
BA
List phenotypes with ratios:
X
b. Cross a heterozygous running, heterozygous black mouse with a heterozygous running,
heterozygous black mouse.
Parent's Genotypes: R x B b R r
Black
Running
Gametes: