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. 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).
1. Genevieve has the genotype _____.
2. Fred’s genotype could be _____ or _____.
3. Explain in your own words how the offspring from the test cross could help determine Fred’s genotype.
4. What could be some weaknesses with using a test cross to determine Fred’s genotype?
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1. Genevieve has the genotype which is recessive and both the alleles are same that is hh
Explanation:
- 2. The genotype of Fred is Hh or HH
- 3.testcross is used to determine the genotype of a person while crossing it with a heterozygous dominant person.
- 4.If all the offspring have the dominant character it means that both the l of the parents are similar however if the allele a different then one of the offspring will become of the recessive character
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