Question

Two black female mice are crossed with a brown male later female1 produced 9 black and 7 brown offspring female 2 produced 57 black offspring during first filial generation then
1) What inference can you make concerning inheritance of black and brown coloured mice?
2) With the help of phenotype given find out what are the genotypes of the parents?

Answer 1

Answer:

i. Inference regarding the inheritance of black and brown colour: Since the black colour genes are dominant over brown colour genes, only black coloured offsprings appear in the first filial generation (in case of female 2).

ii. Since both black and brown offsprings are obtained when female 1 is crossed with a brown male (bb), its genotype would be Bb (heterozygous).

Female 2 will have genotype BB (homozygous).

Answer 2

Answer:

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