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

Name: uhecCV+ +10.5SC9.1scute bristlesechinus eyes9.2ct+crossveinless wings
Uploaded: 2024-03-20T06:43:04.000Z
Channel: Bartleby
Description: uhecCV+ +10.5SC9.1scute bristlesechinus eyes9.2ct+crossveinless wingsTable 1: phenotypewild-typetapdance feetcrossveinless wingstapdance & crossveinlesscut wings15.9vermilion eyesV+ +66.8Drosophila X chromosomeUse the map provided above for problems