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amid [387]
3 years ago
13

: In some breeds of dogs, black (B) is the result of the production of black eumelanin ( a fur pigment protein) and it is domina

nt over brown (b) or the production of brown eumelanin. If we cross a true breeding male black dog with a female brown dog, what are the phenotypes and genotypes of the F1 and F2? In order to solve the problem, follow the steps below while answering the questions.
English
1 answer:
wlad13 [49]3 years ago
5 0

Answer:

Gentoype of F1: all Bb

Phenotype of F1: black

Genotypes and phenotypes of F2:

1/4 BB - black fur

1/2 Bb - black fur

1/4 bb - brown fur

Explanation:

Black fur (B) is dominant over brown fur (b).

A true breeding black dog will have the genotype BB.

A true breeding brown dog will have the genotype bb.

If both of them are crossed:

BB   x   bb

F1 progeny: All Bb with Black fur.

At F2:

Bb   x   Bb

Progeny:

1 BB - black fur

2 Bb - black fur

1 bb - brown fur

<em>Hence:</em>

<em>Gentoype of F1 = all Bb</em>

<em>Phenotype of F1 = black</em>

<em>Genotypes and phenotypes of F2:</em>

<em>1 BB - black fur</em>

<em>2 Bb - black fur</em>

<em>1 bb - brown fur</em>

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