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75% or 3/4.

The two F1 (offspring) mice have a genotype Bb, and express the dominant (brown) trait. When they mate, 1/4 will be BB (homozygous dominant - brown), 2/4 will be Bb (heterozygous - brown), and 1/4 will be bb (homozygous recessive - white).

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Q: A brown mouse is repeatedly mated with a white mouse all the offspring are brown if two of the offspring are mated what fraction of the F2 mice will be brown?
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