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(D) In mice,black coat color $(B)$ is dominant over brown coat color $(b)$. $A$ pure black mouse has the genotype $BB$,while a hybrid black mouse has

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To cross it with a pure brown mouse and all the offsprings must be black or brown in equal numbers.

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(D) In mice,black coat color $(B)$ is dominant over brown coat color $(b)$. $A$ pure black mouse has the genotype $BB$,while a hybrid black mouse has the genotype $Bb$. To determine if a black mouse is pure $(BB)$ or hybrid $(Bb)$,we perform a test cross with a recessive individual (brown mouse,$bb$). $1$. If the black mouse is pure $(BB)$,the cross $BB 	imes bb$ will result in all offspring being black $(Bb)$. $2$. If the black mouse is hybrid $(Bb)$,the cross $Bb 	imes bb$ will result in a $1:1$ ratio of black $(Bb)$ and brown $(bb)$ offspring. Therefore,crossing it with a brown mouse is the standard method to identify the genotype.

Some pure black mice were mistakenly mixed with hybrid black mice. The quickest way to discover whether one individual black mouse is pure is:

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