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Genetics Final 2008 Spring pg 1

Genetics Final 2008 Spring pg 1 - in the same chemical...

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Genetics Final Exam, Spring 2008 1. How many possible allelic combinations are there for 6 independently assorted genes each with two different alleles? a. 6 b. 12 c. 32 d. 48 e. 64 2. You cross two pure breeding lines of flies, one with normal wings and the other with vestigial wings. All F1 flies have normal wings. If the F1’s are crossed to other F1’s and 3200 baby flies are produced, how many do you expect to have vestigial wings if the trait is due to a single gene with Mendelian dominance? a. 400 b. 800 c. 1600 d. 2400 e. 3000 3. What are the expected phenotypic ratios for the following cross: A/a : B/b : c/c : D/d : E/e x A/a : B/b : C/C : D/d ? Assume all genes are unlinked and are not
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Unformatted text preview: in the same chemical pathway. Assume the capital letter allele is dominant in each case. a. 9:9:3:3:3:3:1:1 b. 27:9:9:3:9:3:3:1 c. 27:9:3:3:9:3:3:1 d. 81:27:9:9:27:9:9:3 e. 3:1 4. You perform the following cross of rats: Aa : Bb x Aa : bb What would the phenotypic ratios be in the offspring if locus A shows codominance and locus B shows dominance, both loci are independently assorting, and occupy different chemical pathways? a. 3:3:1:1 b. 9:3:3:1 c. 1:2:1:2:1:2:1 d. 1:1:2:2:1:1 e. 3:4:6:4:3 5. Which of the following genes of the lac operon could be considered a trans-acting element? a. I gene b. operator c. Promoter d. both a and b e. both b and c...
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