are mt answers right for those two questions In mice, black fur (B) is dominant over...

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In mice, black fur (B) is dominant over brown fur (b). Two black mice had only black offspring. Which of the following offspr

are mt answers right for those two questions

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Answer 1

Answer #1

1) Given that the black fur (B) is dominant over brown fur (b).

Two black mice had only black offsprings.

Possibilty 1-

The genotypes of parents (Black)-

BB X BB

	B	B
B	BB	BB
B	BB	BB

When both the parents are homozygous to black allele, they give rise to offsprings who are all black.

The genotype of offspring is- BB

Possibility 2-

When one parent is homozygous black (BB) and another one is heterozygous black (Bb)-

BB X Bb-

	B	b
B	BB	Bb
B	BB	Bb

When one parent is homozygous black (BB) and another one is heterozygous black (Bb), they give rise to offsprings who are all black.

Genotypes of offspring-

BB or Bb

Thus the correct answer is-

a- BB

b- Bb

2) The genotype of the mouse for testcross is bb (white fur).

If the black mouse is homozygous- BB

It will produce all black offsprings.

If the black mouse is heterozygous- Bb

It will produce both black and white offsprings

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Answer 2

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