1. In guinea pigs, black coat color (B) is dominant to white color (b). Give the genotypic and phenotypic ratios in the following crosses. a. Cross a heterozygous black guinea pig with a homozygous black guinea pig. b. Cross a heterozygous black guinea pig with a white one. c. Cross two heterozygous guinea pigs.

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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**Genetics Problems**

1. In guinea pigs, black coat color (B) is dominant to white color (b). Give the genotypic and phenotypic ratios in the following crosses.
   - a. Cross a heterozygous black guinea pig with a homozygous black guinea pig.
   
   - b. Cross a heterozygous black guinea pig with a white one.
   
   - c. Cross two heterozygous guinea pigs.
  
2. In garden peas, round seeds (R) are dominant over wrinkled seeds (r). Cross two heterozygous plants. Give the genotypic and phenotypic ratios.

3. In humans, normal skin pigmentation is the result of the action of a dominant gene (A), which allows pigmentation to develop. All individuals who are homozygous for the recessive allele (a) are unable to produce an enzyme needed for production of the melanin pigment and are therefore referred to as albino. Two normal parents produce an albino child. What are the chances that the next child will be an albino?

4. A normally pigmented woman whose father was an albino marries an albino man whose parents were normal. They have three children, two normal and one albino. Give the genotypes for each person listed.

5. Describe the genotypes and phenotypes of the offspring expected from the following parents. (A represents the dominant gene for normal pigmentation, and a represents its recessive allele.)
   - a. AA and Aa
   
   - b. Aa and aa
   
   - c. Aa and Aa
Transcribed Image Text:**Genetics Problems** 1. In guinea pigs, black coat color (B) is dominant to white color (b). Give the genotypic and phenotypic ratios in the following crosses. - a. Cross a heterozygous black guinea pig with a homozygous black guinea pig. - b. Cross a heterozygous black guinea pig with a white one. - c. Cross two heterozygous guinea pigs. 2. In garden peas, round seeds (R) are dominant over wrinkled seeds (r). Cross two heterozygous plants. Give the genotypic and phenotypic ratios. 3. In humans, normal skin pigmentation is the result of the action of a dominant gene (A), which allows pigmentation to develop. All individuals who are homozygous for the recessive allele (a) are unable to produce an enzyme needed for production of the melanin pigment and are therefore referred to as albino. Two normal parents produce an albino child. What are the chances that the next child will be an albino? 4. A normally pigmented woman whose father was an albino marries an albino man whose parents were normal. They have three children, two normal and one albino. Give the genotypes for each person listed. 5. Describe the genotypes and phenotypes of the offspring expected from the following parents. (A represents the dominant gene for normal pigmentation, and a represents its recessive allele.) - a. AA and Aa - b. Aa and aa - c. Aa and Aa
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