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4 June, 11:30

When true breeding brown dogs are mated with certain true breeding white dogs, all of the F1 pups are white. The F2 progeny from some F1 x F1 crosses were 118 white, 32 black, and 10 brown pups. What is the genetic basis for these results?

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  1. 4 June, 12:58
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    The results indicate that two independently assorting genes are involved (modified 9:3:3:1 ratio), with white blocking the expression of color by the other gene. The ratio of white : color pups is 3:1, indicating that the F. 1 is heterogeneous (W/w). Among colored dogs, the ratio is 3 black : 1 brown, indicating that black is dominant to brown, and the F. 1 is heterogeneous (B/b). The original brown dog is w/w; b/b, and the original white dog is W/W; B/B. The F. 1 progeny are W/w; B/b, and the F. 2 progeny are: 12: 3: 1.

    9 W / -; B/-

    3 W / -; b/b

    3 w/w; B/-

    1 w/w; b/b

    white

    white

    black

    brown
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