October 8, 2015

Homework Help: biology urgent

Posted by alex on Sunday, February 24, 2013 at 9:39pm.

In mice, a gene controlling coat colour has 2 alleles; B (black) and b (white). A pure breeding black mouse is crossed to a white mouse and all the offspring are black. The offspring are then crossed to white mice. The phenotypes of the offspring of this second cross are expected to be
all black.
1/4 black, 3/4 white.
all white.
1/2 black, 1/2 white.
3/4 black, 1/4 white.

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