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Ablack mouse is mated with a brown mouse and all offspring are black expalin full why no brown offspring are produce?
Wiki User
∙ 12y ago
Genetically speaking, there are roughly 8 well known 'Brown' mice. They all have different genes, which creates different shades. You should probably find out what shade of brown this 'Brown' mouse in question is.
There is only one type of Black genetic colouring in mice.
Generally speaking, if we were just using the common Agouti brown mouse (wild colour) & crossed it to Black, then the entire litter should've resulted in Agouti mice. However, Agouti being represented by a dominant A-, & the Black being represented by a recessive AA, crossing A- to AA would result in an entire litter of Aa = Agouti carring Black.
If you crossed one of those offspring back to the Black parent, you would get Aa & AA in the litter, resulting in the litter being 50% black, 50% Agouti.
However, if the 'Brown' mouse wasn't Agouti, & was actually another brown called Chocolate (I'm serious), then crossing Black (which in this case will be BB) to Chocolate (bb) would result in an entire litter of Blacks carrying Chocolate (Bb) . If you crossed 2 of the offspring together, you would get a mix of Blacks & Chocolates.
NB: Black is a dominant gene to all other genes but Agouti.
Wiki User
∙ 12y ago
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