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  4. 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 ?

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Q. 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 ?

Principles of Inheritance and Variation

Solution:

The cross between black mouse $(BB)$ and a brown mouse $(bb)$ and the inbreeding of their hybrid progeny is shown below.
image
Hence, phenotypic ratio is $3$ black : $1$ brown i.e. $75\%$ of the progeny would have black coat.