There is a teacher from Texas that loves hairless guinea pigs. In guinea pigs, the
dominant allele H codes for the trait of having hair and the allele h codes for the
trait of being hairless. (Assume Mendelian inheritance). Let’s say that this teacher
receives her wish of finding a hairless guinea pig at a pet store and names her
Genevieve. She finds another guinea pig at a store with hair that she names Fred.
While she can be certain of Genevieve’s genotype, how could she determine what
genotype Fred is? She can do a test cross! A test cross involves breeding an organism with a dominant
trait (like Fred) with an organism that exhibits a recessive trait (like Genevieve).
Fred’s genotype could be ________ or _________.
