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  • In mice, black coat colour (allele B ) is dominant to brown coat colour (allele b) . The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What perc

In mice, black coat colour (allele B ) is dominant to brown coat colour (allele b) . The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats?

Option: 1

25 %


Option: 2

50 %


Option: 3

75 %


Option: 4

100 %


Answers (1)

best_answer

As we larnt ,

Use of Law of Dominance -

Law of dominance is used to explain the expression if only one of the parental characters in a monohybrid corss in F1 and the expression of both in F2 .

- wherein

This is also explains the proportion of 3 : 1 obtained in F2

 

 The cross between black mouse (BB) and a brown mouse (bb) and the inbreeding of their hybrid progeny is shown below.

Hence , phenotypic ratio is 3 black : 1 brown i.e. 75 % of the progeny would have black coat.

Posted by

Deependra Verma

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