2. A mating of one strain of pure-breeding yellow mice with pure-breeding brown
mice resulted in black hybrids. A cross between the black Fs hybrids produces
42 black, 18 brown, and 20 yellow offspring, At least two different models of
genetic constitution conform to the observed data. (a) Please describe these
models of genetic constitution and use the Chi-square test for goodness-of-fit
to evaluate how the model conforms to observed results. (10 points) (b) In
order to validate which model is correct, please design a crossing scheme and
explain how the expected phenotypes of progenies in this cross are able to
distinguish the aforementioned models. The two parents of this crossing
scheme must come from the existed mice. (10 points)
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