Exam108 - General Genetics Page 1 of 3 General Genetics...

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General Genetics 3100:211 Fall, 2008 Exam 1 ID___________________ Form B 1. A red-eyed long wing fly is mated to a brown-eyed, long wing fly. The progeny are: 51 long red, 53 long brown, 18 short red, 16 short brown. What are the genotypes of the parents? RrLl X rrLl 2. Consider a family of 4 children. Calculate the probability of any combination of sexes in the children other than 4 boys. 15/16 3. Wheat has 2n=42 chromosomes and rye has 2n=14 chromosomes. How many chromosomes would a wheat/rye hybrid have? 28 4. How many Barr bodies would you see in the nuclei of individuals with an XXXYY sex chromosome karyotype? 2 5. In Drosophila cut wings are controlled by a sex-linked recessive allele (c) and fuzzy body is controlled by an autosomal recessive allele (f). When a fuzzy female is mated to a cut male, all offspring are wild type. If a son and daughter from this cross were mated what proportion of the offspring would be cut fuzzy males? 1/16 6. A certain plant has 8 chromosomes, one large metacentric pair, a small acrocentric pair and 2 telocentric pairs, one large and one small. If this plant were to self fertilize, what proportion of the offspring would have two telocentric chromosomes? all 7. From a cross of two individuals heterozygous at each of three loci, what proportion of their offspring will have be homozygous dominant at all three loci?
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