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Problem 1: A new gene is being investigated in fruit flies. The recessive allele of this gene (t) causes the flies' feet to grow tiny tapdance shoes, while the dominant allele (t*) permits wild-type feet to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established crossveinless wings gene (cv). You cross a female heterozygous for both genes with a testcross male fly and obtain the male offspring results shown in table 1, below. Using this information, answer the following questions: is the original female a coupling or repulsion heterozygote, with regards to genes t and cv? (circle one) what is the map distance between genes t and cv? cM based on these results, gene t must be located between what two genes on the map? (list both possible gene pairs) or d) you perform another two-point testcross between gene t and gene ct and obtained the results in table 2, bela Now, you can localize gene t to be specifically between which two genes? a) b) c) Table 1: phenotype wild-type tapdance feet crossveinless wings tapdance & crossveinless # male offspring 13 405 401 11 Table 2: phenotype wild-type tapdance feet cut wings tapdance & cut # male offspring 27 421 427 30

Problem 1: A new gene is being investigated in fruit flies. The recessive allele of this gene (t) causes the flies' feet to grow tiny tapdance shoes, while the dominant allele (t*) permits wild-type feet to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established crossveinless wings gene (cv). You cross a female heterozygous for both genes with a testcross male fly and obtain the male offspring results shown in table 1, below. Using this information, answer the following questions: is the original female a coupling or repulsion heterozygote, with regards to genes t and cv? (circle one) what is the map distance between genes t and cv? cM based on these results, gene t must be located between what two genes on the map? (list both possible gene pairs) or d) you perform another two-point testcross between gene t and gene ct and obtained the results in table 2, bela Now, you can localize gene t to be specifically between which two genes? a) b) c) Table 1: phenotype wild-type tapdance feet crossveinless wings tapdance & crossveinless # male offspring 13 405 401 11 Table 2: phenotype wild-type tapdance feet cut wings tapdance & cut # male offspring 27 421 427 30

Biology 2e
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter23: Protists
Section: Chapter Questions
Problem 13RQ: Alternation of generations describes which of the following? The haploid form can be multicellular;...
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uh ec CV + + 10.5 SC 9.1 scute bristles echinus eyes 9.2 ct + crossveinless wings Table 1: phenotype wild-type tapdance feet crossveinless wings tapdance & crossveinless cut wings 15.9 vermilion eyes V + + 66.8 Drosophila X chromosome Use the map provided above for problems 1 & 2. Problem 1: 11.2 10.9 garnet eyes M A new gene is being investigated in fruit flies. The recessive allele of this gene (t) causes the flies' feet to grow tiny tapdance shoes, while the dominant allele (t*) permits wild-type feet to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established crossveinless wings gene (cv). You cross a female heterozygous for both genes with a testcross male fly and obtain the male offspring results shown in table 1, below. Using this information, answer the following questions: # male offspring 13 405 401 11 forked bristles a) is the original female a coupling or repulsion heterozygote, with regards to genes t and cv? (circle one) b) what is the map distance between genes t and cv? cM c) based on these results, gene t must be located between what two genes on the map? (list both possible gene pairs)______ or d) you perform another two-point testcross between gene t and gene ct and obtained the results in table 2, below. Now, you can localize gene t to be specifically between which two genes? Table 2: phenotype wild-type tapdance feet cut wings tapdance & cut # male offspring 27 421 427 30
Transcribed Image Text:uh ec CV + + 10.5 SC 9.1 scute bristles echinus eyes 9.2 ct + crossveinless wings Table 1: phenotype wild-type tapdance feet crossveinless wings tapdance & crossveinless cut wings 15.9 vermilion eyes V + + 66.8 Drosophila X chromosome Use the map provided above for problems 1 & 2. Problem 1: 11.2 10.9 garnet eyes M A new gene is being investigated in fruit flies. The recessive allele of this gene (t) causes the flies' feet to grow tiny tapdance shoes, while the dominant allele (t*) permits wild-type feet to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established crossveinless wings gene (cv). You cross a female heterozygous for both genes with a testcross male fly and obtain the male offspring results shown in table 1, below. Using this information, answer the following questions: # male offspring 13 405 401 11 forked bristles a) is the original female a coupling or repulsion heterozygote, with regards to genes t and cv? (circle one) b) what is the map distance between genes t and cv? cM c) based on these results, gene t must be located between what two genes on the map? (list both possible gene pairs)______ or d) you perform another two-point testcross between gene t and gene ct and obtained the results in table 2, below. Now, you can localize gene t to be specifically between which two genes? Table 2: phenotype wild-type tapdance feet cut wings tapdance & cut # male offspring 27 421 427 30
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In letter B: If the map distance equals the number of recombinant/total of offspring, wouldn't it be 24/806 x 100? Wouldn't we add both recombinants?

Can you explain letter C? I don't grasp that concept well.

And since I'm using my question already, would you be able to answer D. 

Thank you!

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