Question

In: Biology

In mice, the ability to run normally is a dominant trait. Mice with this trait are...

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).

A) Cross a heterozygous running mouse with a homozygous running mouse.

i. What are the parentgenotypes? __________ x ____________

ii. Draw the punnett square

iii. What is the genotype ratio?

iv. What is the phenotype ratio?

.

B) Cross a homozygous brown mouse with a homozygous brown mouse.

i. What are the parent genotypes? __________ x ____________

ii. Draw the punnett square

iii.What is the genotype ratio?

iv. What is the phenotype ratio?

C) Cross a homozygous waltzing mouse with a heterozygous running mouse.

i. What are the parent genotypes? __________ x ____________

ii. Draw the punnett square

iii. What is the genotype ratio?

iv. What is the phenotype ratio?

D). Cross a homozygous waltzing, heterozygous blackmouse with a homozygous waltzing, heterozygous black mouse.

i. What are the parent genotypes? __________________ x ___________________

ii. Draw the punnett square (4x4 square)

iii. What is the phenotype ratio?

E). Cross a homozygous running, heterozygous blackmouse with a waltzing, brown mouse.

i.What are the parentgenotypes? __________________ x ___________________

ii. Draw the punnett square (4x4 square)

iii. What is the phenotype ratio?

Solutions

Expert Solution

  1. Rr X RR

Rr, RR, RR, Rr

So all will be running mice with a genotypic ratio of 1:1 or Rr and RR

Phenotypic ratio = 4:0

2. B)

bb xbb

bb,bb,bb,bb

100% brown mice.

Genotypic and phenotypic ratio will be 4:0

C)

rr X Rr

Rr, Rr, rr, rr

Phenotypic ratio = 1:1 of walting to running mice

Genotypic ratio 1:1 of walting to running mice

D).

rrBb X rrBb

F1 rB, rb

rb

rB

rB

rb

rb

rrbb

rrBb

rrBb

rrbb

rB

rrBb

rrBB

rrBB

rrBb

rB

rrBb

rrBB

rrBB

rrBb

rb

rrbb

rrBb

rrBb

rrbb

Genotypic ratio: 4rrbb, 8rrBb, 4 rrBB (1:2:1)

Phenotypic ratio: 4 walting brown mice: 12 walting black mice

1:3

E).

RB, Rb X rb Punette square

rb

rb

rb

rb

RB

RrBb

RrBb

RrBb

RrBb

RB

RRBb

RRBb

RRBb

RRBb

Rb

Rrbb

Rrbb

Rrbb

Rrbb

Rb

Rrbb

Rrbb

Rrbb

Rrbb

Genotypic ratio: 8 RrBb : 8Rrbb (1:1) Running black: running brown

Phenotypic ratio: 1:1 Running black: running brown

gladiator answered 2 years ago
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