Genetic Problems

Genetic Problems - Bio 1222 Additional (Optional) Genetics...

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Bio 1222 Additional (Optional) Genetics Problems October 2008 Genetics Problems 1. Flower position, stem length, and seed shape were three characters that Mendel studied. Each is controlled by an independently assorting gene and has dominant and recessive expression as follows: Character Dominant Recessive Flower position Axial (A) Terminal ( a) Stem length Tall (T) Dwarf (t) Seed shape Round (R) Wrinkled (r) If a plant that is heterozygous for all three characters is allowed to self-fertilize, what proportion of the offspring would you expect to be as follows? ( Note: Use the rules of probability instead of a huge Punnett square.) a. homozygous for the three dominant traits b. homozygous for the three recessive traits c. heterozygous for all three characters d. homozygous for axial and tall, heterozygous for seed shape 2. Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, have three children, what is the probability of each of the following? a. All three children are of normal phenotype. b. One or more of the three children have the disease. c.
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This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

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Genetic Problems - Bio 1222 Additional (Optional) Genetics...

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