You are breeding two different strains of mice. One strain that produces small m

Question

You are breeding two different strains of mice. One strain that produces small mice (averaging 40 g) and one strain that produces large mice (averaging 110 g). You cross a female of the small mouse strain with a male from the large mouse strain. What would you expect to see in the F, generation if mouse size was determined by one gene ? (There are two possible answers depending on which allele you suppose to be dominant). Instead of your expectations (answer to question 17 above) you obtain the results show in Figure 1 below. You conclude that mouse weight is most likely controlled by

Explanation / Answer

Answer:

17)

Female small mouse with male large mouse

If we take large mouse as dominant,

   (large) LL    x     ll (small)

then we get: Ll, Ll, Ll, Ll

All are large mouse is obtained from the cross between large and small mouse.

If we take small mouse as the dominant, then

LL(small mouse) x ll (large mouse),

we get all small mouse,    Ll, Ll, Ll, Ll (all are small mouse).

18) mutiple genes.

The condition is called the polygenic inheritance, where one character is controlled by two or more genes.

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