Genetics Midterm 2 version 1 f08

Genetics Midterm 2 version 1 f08 - Midterm II Version 1...

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Midterm II Version 1 (Blue) Answer Key 1. If the genes L and R are very tightly linked, which of the following results represent the offspring of a dihybrid test-cross? Assume the alleles are in the trans configuration in the dihybrid. Answer is d) 100 with rex coats and lop ears and 100 with normal coats and normal ears. 2. If genes L and R are 20 map units apart on chromosome 1, which of the following results represent the offspring of a dihybrid test-cross? Assume the alleles are in the cis configuration in the dihybrid. Answer is a) 160 with rex coats and normal ears, 160 with normal coats and lop ears, 40 with rex coats and lop ears and 40 with normal coats and normal ears. 3. If the gene that controls ear posture maps to chromosome 9 and the gene that controls coat texture maps to chromosome 12, which of the following results represent the offspring of a dihybrid test-cross? Answer is c) 50 with rex coats and lop ears, 50 with rex coats and normal ears, 50 with normal coats and lop ears and 50 with normal coats and normal ears. 4. What is/are the genotype/s of the above dihybrid parents?
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Genetics Midterm 2 version 1 f08 - Midterm II Version 1...

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