A5. In guinea pigs, short hair is dominant over long hair. If a short haired SS guinea pig is crossed with a long haired ss guinea pig, solve the possible genotypes and phenotypes of their offspring and the percent chance of each?
S S
s 1. Ss 2. Ss
s 3. 4. Ss
a) Phenotype for Box 1:
b) Phenotype for Box 2:
c) Genotype for Box 3:
d) Phenotype for Box 4:
Answers
Answer:
In the guinea pig, short coat (C) is dominant to long coat (c). Guinea pig with genotype cc will have long hair. However, a guinea pig with short hair would have either genotype Cc or cc. To confirm the homozygosity of short-haired guinea pig, the breeder must do test cross. In test cross, the animal whose genotype is not known is bred with the animal having a homozygous recessive trait. In the given case, short-haired guinea pig (CC/Cc) can be bred with long-haired guinea pig (cc). If this produces both short haired (Cc) and long-haired (cc) progeny, then the short haired guinea pig will be heterozygous. If this produces only short haired (Cc) progeny, then the short haired guinea pig will be homozygous.
Thus, the correct answer is 'Breed the animal with one that is homozygous for long hairless and watch for short hair offspring
Explanation:
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