Two dominant mutations that are linked on the third chromosome and each is homozyogus recessive lethal: Tubby (Tb) in the Tb+ gene results in short/fat “tubby“ bodies. Another dominant mutation serrate (Ser) in the Ser+ gene results in serrated wings. Tb flies with normal wings were crossed to Ser flies with normal body. Assuming no recombination, the expected progeny and their proportions are:
Homework Answers
Ans 1- C is correct
As these are dominant mutaion.
three of the progenies will have some sort of mutation (because they contain domiant factor. and one will have wild character normal body and normal wings.
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Two dominant mutations that are linked on the third chromosome
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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...
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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; b is associated with buckled wings; and c 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 the following results. From this data, calculate the map distance between a and...
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