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White fur color is recessive and brown is dominant. The white mouse has a genotype of bb and the brown mouse has a genotype of BB. All offspring would be heterozygous with a genotype of BB and brown fur.

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14y ago
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14y ago

The gene for white mice is recessive. If a brown mouse carrying only brown genes mates with a white mouse the offspring will be brown but will carry a white gene. That means when a white mouse is mated to a brown mouse carrying a white gene the mouse could be white or brown.

If a brown mouse carrying a white gene and a brown gene was mated to another brown mouse that also had a white gene (because it was born from the union of a white mouse and a brown mouse) it could produce either a brown mouse or a white mouse.

2 white mice can only produce a white mouse unless a spontaneous mutation occurs (which is rare but possible)

The possible gene combinations from 2 mice carrying both white and brown genes would be :-
brown gene + brown gene= brown mouse or
white gene + brown gene = brown mouse or
white gene + white gene = white mouse

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11y ago

homozygous recessive

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4y ago

Homozygous recessive

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Q: A white mouse whose parents are both produces only brown offspring when mated with a brown mouse The white mouse is most probably what?
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