18. Short hair in rabbits is governed by a dominant gene (L) and long hair by...

18. Short hair in rabbits is governed by a dominant gene (L) and long hair by a recessive allele (l). Black hair results form the action of the dominant genotype (B_) and brown from the recessive genotype (bb). In a cross between homozygous short, black haired rabbit and a homozygous long, brown haired rabbit what are the phenotypic and genotypic ratios of the F1 and F2 generation.

Solutions

Expert Solution

Genotype of homozygous short and black haired rabbit - LLBB.

Genotype of homozygous long, brown haired rabbit - llbb.

Cross LLBB X llbb

Gametes formed LB lb

F₁ generation LlBb(short and black haired rabbit) X LlBb

Gametes formed LB, Lb, lB and lb LB, Lb, lB and lb.

F₂ generation:

Male/Female	LB	Lb	lB	lb
LB	LLBB(short and black haired rabbit)	LLBb(short and black haired rabbit)	LlBB(short and black haired rabbit)	LlBb(short and black haired rabbit)
Lb	LLBb(short and black haired rabbit)	LLbb(short and brown haired rabbit)	LlBb(short and black haired rabbit)	Llbb(short and brown haired rabbit)
lB	LlBB(short and black haired rabbit)	LlBb(short and black haired rabbit)	llBB(long and black haired rabbit)	llBb(long and black haired rabbit)
lb	LlBb(short and black haired rabbit)	Llbb(short and brown haired rabbit)	llBb(long and black haired rabbit)	llbb(long and brown haired rabbit)

The phenotypic ratios of the F₁ generation- All are short and black haired rabbit.

The genotypic ratios of the F₁ generation - All have LlBb genotype.

The phenotypic ratios of F₂ generation - 9:3:3:1.

Short and black haired rabbit - 9

Short and brown haired rabbit - 3.

Long and black haired rabbit - 3.

Long and brown haired rabbit - 1

The genotypic ratios of F₂ generation - 1:2:2:4:1:2:1:2:1.

LLBB - 1.

LLBb - 2.

LlBB - 2.

LlBb - 4.

LLbb - 1.

Llbb - 2.

llBB - 1.

llBb - 2.

llbb - 1.

gladiator answered 1 year ago

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