In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous short haired guinea pig have? What genotype would a purebreeding short haired guinea pig h... In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous short haired guinea pig have? What genotype would a purebreeding short haired guinea pig have? What genotype would a long haired guinea pig have? Show the cross for two heterozygous guinea pigs. What percentage of the offspring will have short hair? What percentage of the offspring will have long hair?
Understand the Problem
The question is related to genetics, specifically dealing with genotypes and phenotypes in guinea pigs, where short hair is a dominant trait. The question asks to determine the possible genotypes for a heterozygous short-haired guinea pig, a purebreeding short-haired guinea pig, and a long-haired guinea pig. Additionally, the question asks to perform a cross between two heterozygous guinea pigs and determine the percentage of offspring with short and long hair.
Answer
The genotypes are: Ss, SS, ss. The cross is: Ss x Ss. The percentages are: 75% short hair and 25% long hair.
Here are the answers:
- Heterozygous short-haired guinea pig: Ss
- Pure breeding short-haired guinea pig: SS
- Long-haired guinea pig: ss
- Cross for two heterozygous guinea pigs: Ss x Ss
- Percentage of offspring with short hair: 75%
- Percentage of offspring with long hair: 25%
Answer for screen readers
Here are the answers:
- Heterozygous short-haired guinea pig: Ss
- Pure breeding short-haired guinea pig: SS
- Long-haired guinea pig: ss
- Cross for two heterozygous guinea pigs: Ss x Ss
- Percentage of offspring with short hair: 75%
- Percentage of offspring with long hair: 25%
More Information
In genetics, the dominant allele masks the presence of the recessive allele in heterozygous individuals.
Tips
Common mistake: Confusing heterozygous and homozygous genotypes. Remembering that heterozygous means different alleles (Ss) and homozygous means the same alleles (SS or ss) will prevent this.
Sources
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