Suppose a scientist is studying the platypus, one of the few venomous mammals. The male platypus produces venom in the crural glands located beneath the calcaneous spur on each of its hind limbs. The female platypus can develop calcaneous spurs, but the crural glands never develop.
Which of the following libraries would be most useful to help the scientist identify the gene or genes responsible for venom production?
a) genomic DNA library generated from the crural gland of a female platypus
b) cDNA library made from the mRNA isolated from the crural gland of a male platypus
c) genomic DNA library generated from the crural gland of a male platypus
d) cDNA library generated from mRNA isolated from a mixture of different male platypus tissues
e) genomic DNA library generated from a mixture of different male platypus tissues
