To draw a genetic map for three linked, recessive mutations for blowfish, rancid, spiny and toxic....
To draw a genetic map for three linked, recessive mutations for blowfish, rancid, spiny and toxic. You test triply heterozygous blowfish to toxic. The results are as follows:
rancid spiny toxic r s t 1
rancid r + + 64
spiny + s + 84
rancid toxic r + t 96
toxic + + t 367
wild type + + + 4
spiny toxic + s t 46
rancid spiny r s + 338
total 1000
Following questions below to draw the genetic map for these genes.
1. Which gene is in the middle? (Choose from rancid, spiny and toxic)
2. What is the genetic distance between gene rancid and toxic? (Answer in cM value with one decimal place, eg. 12.3 cM)
3. What is the genetic distance between gene rancid and spiny? (Answer in cM value with one decimal place, eg. 12.3 cM)
4. What is the genetic distance between gene spiny and toxic? (Answer in cM value with one decimal place, eg. 12.3 cM)
5. What is the frequency of double crossover?
6. What is the expected frequency of double crossover? (Calculate to the fourth decimal place, eg. 0.0123)
7. What is coefficient of coincidence? (Keep three decimal places, eg. 0.123)
8. What is the crossover interference. (Keep three decimal places, eg. 0.123)
Homework Answers
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To draw a genetic map for three linked, recessive mutations for
blowfish, rancid, spiny and toxic....
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a,...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait, bis associated with buckled wings, and is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. Which gene is in the middle? Testcross progeny phenotype Number curved 277 anomalous, buckled...
Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called...
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im not sure how to calcualte the double crossover offspring A cross in Drosophila involved the...
im not sure how to calcualte the double crossover
offspring
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1. The following diagram shows the genetic map for a chromosome. A B C D 10cM...
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Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called tk, r, and s, where tk is associated with thick wings, r is associated with round wings, and s is associated with sharp wings. He first crosses homozygous sharp birds to homozygous thick, round birds. Next, he testcrosses the F1 progeny to thick, round, sharp birds. He obtained the results shown. Given this data, label the progeny phenotypic classes as either parental, single crossover...
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A cross in Drosophila involved the recessive, X-linked genes yellow (y), white (w), and cut (ch. A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut . The F, females were wild type for all three traits. • The F, males expressed the yellow-body and white-eye traits. The cross was carried to an F2 progeny, and only male offspring were tallied. On the basis of the data...
(9 points) You are interested in studying recombination frequencies in wasps. You identify a queen that is heterozygous at three different loci on chromosome 5: G, H, and R. As queen wasps can produce haploid male offspring without fertilizing their eggs, you decide to look only at the genotypes of her male offspring in your analysis. Below is a list of the genotypes of her male offspring, and the number of individuals that fall into each genotypic class. 92 168...
im not sure how to calcualte the double crossover
offspring
A cross in Drosophila involved the recessive, X-linked genes yollow (y), white (w), and cut (ch). A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut • The F, females were wild type for all three traits. The F, males expressed the yellow-body and white-eye traits. The cross was carried to an F2 progeny, and only male...
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