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Sample Exam 2 key - 1 A pure-breeding strain of...

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1) A pure-breeding strain of crysanthemums with long stems and grey anthers was crossed with another pure-breeding strain with short stems and black anthers. All of the plants from this cross had long stems and black anthers (F 1 ). These plants were crossed with a pure-breeding strains with short stems and grey anthers, yielding these progeny: 221 long stems, grey anthers 229 short stems, black anthers 22 long stems, black anthers 28 short stems, grey anthers a. (4 pts) Which traits are dominant? long stems, black anthers b. (4 pts) Which alleles are linked? (list 2 pairs) long with grey, short with black c. (4 pts) What is the map distance between the genes that control stem length and anther color? 10 m.u. d. (4 pts) If the F 1 plants were self-crossed instead, what percentage of the progeny would have short stems and grey anthers? 0.25% e. (4 pts) What percentage of the progeny from an F 1 selfcross would have short stems and black anthers? 24.75%
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2) You have a pea plant that is heterozygous at 3 loci, A, B, and C. The genetic map of these 3 loci is shown below with map distances. You also know that one of the parental pure-breeding strains expressed the A and B dominant traits but not C, while the other parental pure-breeding strand expressed the C trait but A or B. The interference in this region is estimated as 0.8. (Use 3 significant digits in your answers). You do a testcross of your heterozygous strain with a pure-breeding strain that is homozygous recessive at all three loci.
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