BIO325 Exam 1 - 1 GENETICS BIO325 Spring 2011 Prof Janice...

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1 GENETICS – BIO325 Spring 2011 Prof: Janice Fischer EXAM #1 Feb 10, 2011 Name ANSWERS and explanations
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2 1. An F1 plant of the genotype AaBbCcDDEe self-crosses. All of the alleles obey Mendel’s two laws. The plant was produced by a cross between one pure-breeding homozygous dominant parent, and another pure-breeding parent. A. What are the genotypes of the parents of this F1 plant? Circle your answer (5) AABBCCDDEE and aabbccDDee B. How many different gamete types are produced by this F1 plant? Circle your answer (5) 2 4 C. At what frequency are AbCDE gametes produced by the F1 plant? Circle your answer (5) 1/2 4 D. What fraction of the F2 progeny have the genotype AAbbCCDDEE? Circle your answer (5) (1/2 4 X 1/2 4 ) = 1/2 8 or ( ! x ! x ! x 1 x ! ) = 1/4 4 2. In a certain breed of plants, thorns are determined by the alleles of the T gene. Thorns are associated with the completely dominant allele T, and the absence of thorns is associated with the completely recessive allele t. T is 80% penetrant in the heterozygote, and 100% penetrant in the homozygote. If you make the parental cross TT X tt, and then cross the F1 to each other, what would be the
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BIO325 Exam 1 - 1 GENETICS BIO325 Spring 2011 Prof Janice...

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