In which trimester do the bony parts of the skeleton begin to form
a. first
b. second
c. third
d. none of the above

B. Second

Explanation:

In the second trimester the bony parts of the skeleton begin to form .

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

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