04key_1st_Mid_211.DO

04key_1st_Mid_211.DO - Name:_Key_ ID#:_Section:_ 1 st...

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Name:________ Key _____________________________ ID#:___________________________________________Section:________ 1 st Midterm LS4 Feb 11, 2004 1. (12pts) 2. (10 pts) 3. (8 pts) 4. (10 pts) 5. (8 pts) 6. (8 pts) 7. (8 pts) 8. (8 pts) 9. (8 pts) 10. (8 pts) 11. (12 pts) 1. (12 pts) Recall that in peas round [R] is dominant to wrinkled [r], and yellow [Y] is dominant to green [y]. Crosses between purebreeding round green and wrinkled yellow are used to produce F1 and a variety of F2 progeny. Some crosses between these progeny are listed below. a. A cross of F1 x a round green plant (from the F2) yielded progeny in the ratios of 3/8 round yellow, 3/8 round green, 1/8 wrinkled yellow and 1/8 wrinkled green. What is the genotype of the round green parent? i) RrYy ii) RrYY iii) Rryy iv) rrYy v) rryy b. From the cross of rrYy x Rryy what proportion of progeny are round yellow? i) 9/16 ii) 7/16 iii) 4/16 iv) 3/16 v) 1/16 c. From the above cross what fraction of progeny will resemble the parental phenotypes? i) 9/16 ii) 1/2 iii) 1/4 iv) 1/8 v) 1/16
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2 (10 pts). John and Mary ask you to calculate the chance their first born child will have cystic fibrosis. Both John and Mary have siblings with cf. a. draw their pedigree b. What do you tell them? i) 1/9 ii) 2/9 iii) 3/9 iv) 4/9 v) 5/9 c. John and Mary also ask you for the chance their first born will be a heterozygous carrier for cf. What do you tell them? i) 1/9 ii) 2/9 iii) 3/9 iv) 4/9 v) 5/9 3. (8 pts) In Fly Lab you cross E phenotype females with TR males and get all TR daughters and + sons. You also cross F females and CY males and get CY daughters and CY, F sons. Assume all parental lines are purebreeding. a. Based on these results predict the progeny phenotypes from the cross of TR parental females and F males TR χ Dominant i) all + daughters and sons E autosomal recessive ii) + daughters and TR sons F recessive
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This note was uploaded on 08/20/2008 for the course CHEM 14D taught by Professor Hardinger during the Spring '08 term at UCLA.

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04key_1st_Mid_211.DO - Name:_Key_ ID#:_Section:_ 1 st...

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