Bully whippets are abnormally heavily muscled because _____
a. they have a over-abundance of testosterone
b. they have an over-abundance of growth hormone
c. they are heterozygous for the deletion in the myostatin gene
d. they are homozygous for the wild-type myostatin gene
e. they are homozygous for the deletion in the myostatin gene
ANSWER: e
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