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Procedure 17.1: Determining Genotypic and Phenotypic Ratios for Albinism Albinos are homozygous recessive for the pair of alleles that produce pigments of skin, hair, and eyes. Suppose a woman with normal colored skin, but with an albino mother, marries an albino man. We need to record the genotypic and phenotypic ratios of their children. Genotype of children's mother: _ Genotype of children's father: _ Possible gametes of mother: _ Possible gametes of father: _ Possible offspring: _ Genotypic ratio of children: _ Phenotypic ratio of children: _ Question 1: A. What is the expected genotype for the F1 generation? B. Will all F1 offspring have the same genotype? C. Will all F1 offspring have the same phenotype? Question 2: A. What are the predicted phenotypes for the F2 (i.e., second) generation that is produced by the cross RrSs X RrSs? B. In what ratio will they occur? To test the prediction in question 4, count the number of kernels having each of the following phenotypes in five rows of kernels on the cobs of corn available in the lab. These kernels are F1 generation produced by the cross RrSs X RrSs. Red, Smooth: Red, Wrinkled: White, Smooth: White, Wrinkled: __ A. What are the genotypes of the F2 generation that is produced by the cross RrSs X RrSs? B. In what ratio will they occur?

          Procedure 17.1: Determining Genotypic and Phenotypic Ratios for Albinism

Albinos are homozygous recessive for the pair of alleles that produce pigments of skin, hair, and eyes. Suppose a woman with normal colored skin, but with an albino mother, marries an albino man. We need to record the genotypic and phenotypic ratios of their children.

Genotype of children's mother: ___
Genotype of children's father: ___
Possible gametes of mother: ___
Possible gametes of father: ___
Possible offspring: ___
Genotypic ratio of children: ___
Phenotypic ratio of children: ___

Question 1:
A. What is the expected genotype for the F1 generation?
B. Will all F1 offspring have the same genotype?
C. Will all F1 offspring have the same phenotype?

Question 2:
A. What are the predicted phenotypes for the F2 (i.e., second) generation that is produced by the cross RrSs X RrSs?
B. In what ratio will they occur?

To test the prediction in question 4, count the number of kernels having each of the following phenotypes in five rows of kernels on the cobs of corn available in the lab. These kernels are F1 generation produced by the cross RrSs X RrSs.

Red, Smooth: __
Red, Wrinkled: __
White, Smooth: __
White, Wrinkled: __

A. What are the genotypes of the F2 generation that is produced by the cross RrSs X RrSs?
B. In what ratio will they occur?

Added by Jennifer S.

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