In mice, black fur (B) is dominant over brown fur (b).Breeding a brown mouse and
ID: 1853 • Letter: I
Question
In mice, black fur (B) is dominant over brown fur (b).Breeding a brown mouse and a homozygous black mouse produces allblack offspring. A. What is the genotype of the gametes produced by thebrown-furred parent? B. What genotype is the brown-furred parent? C. What genotype is the black-furred parent? D. What genotype is the black-furred offspring? E. If two F1 mice are bred with one another, whatphenotype will the F2 offspring be, and in whatproportion? phenotype---------- proportion-------- In mice, black fur (B) is dominant over brown fur (b).Breeding a brown mouse and a homozygous black mouse produces allblack offspring. A. What is the genotype of the gametes produced by thebrown-furred parent? B. What genotype is the brown-furred parent? C. What genotype is the black-furred parent? D. What genotype is the black-furred offspring? E. If two F1 mice are bred with one another, whatphenotype will the F2 offspring be, and in whatproportion? phenotype---------- proportion--------Explanation / Answer
Dominant trait =B- black fur
Recessive trait =brown fur –b
Breeding a brown mouse and a homozygous black mouse produces allblack offspring
brown mouse bb X homozygousblack BB
GAMETES
B
B
b
Bb black fur
Bb black fur
b
Bb black fur
Bb black fur
A. What is the genotype of the gametes produced by thebrown-furred parent?
ANSWER :b
B. What genotype is the brown-furred parent?
Answer :brown mouse bb
C. What genotype is the black-furred parent?
Answer: homozygousblack BB
D. What genotype is the black-furred offspring?
Answer :B
E. If two F1 mice are bred with one another, whatphenotype will the F2 offspring be, and in whatproportion?
Bb black fur X Bb black fur
B
b
B
B B black fur
Bb black fur
b
Bb black fur
bb brown
Phenotype-------3 black fur :1 brown
Proportion- 1 B B blackfur: 2 Bb blackfur : 1 bb brown
GAMETES
B
B
b
Bb black fur
Bb black fur
b
Bb black fur
Bb black fur
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