Q1 of 32 Page 32

In a certain species of animals, black fur (B) is dominant over brown fur (b). Predict the genotype and phenotype of the offspring when both parents are 'Bb' or have heterozygous black fur.


In F1 generation


BB = Homozygous black = 1


Bb = Heterozygous black = 2


bb = Homozygous brown = 1


Thus, in F1 generation;


Genotype = 1 : 2 : 1


Phenotype = 3 : 1


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Does the sex of the child depend on the father or it is just a matter of chance? Discuss.

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(a) Can you tell which coat' colour (black or white) is dominant? ………………………….


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