You cross a true breeding pink eyed, long nosed Shmoo to a pure breeding blue ey

Question

You cross a true breeding pink eyed, long nosed Shmoo to a pure breeding blue eyed, short nosed Shmoo. All of the offspring are blue eyed and long nosed. When you cross some of the F1s you get the following results:

98 blue, long 42 blue, short 37 pink, long 13 pink, short

How many pink, short Shmoos would you expect?

You cross a true breeding pink eyed, long nosed Shmoo to a pure breeding blue eyed, short nosed Shmoo. All of the offspring are blue eyed and long nosed When you cross some of the F1s you get the following results: 98 blue, long 37 pink, long 13 pink, short 42 blue, short How many pink, short Shmoos would you expect? 35.625 106.875 47.5 11.875

Explanation / Answer

Let us assume here that the ratio of four phenotypes in the population is 9:3:3:1

Now total number of observed frequencies = (98+42+37+13)=190

Thus expected frequency of short pink shmoos = 190*3/16 =35.625

Hence the correct answer is 35.625

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