Question

In Drosophila, black, purple, and curved are three recessive genes. A trihybrid female is testcrossed and...

In Drosophila, black, purple, and curved are three recessive genes. A trihybrid female is testcrossed and the following offspring are obtained: (10 points)

Black, purple, curved 5617

Wild-type 5701

Curved, purple 388

Black 367

Curved 1412

Black, purple 1383

Purple 60

Black, curved 72

a) What are the parental genotypes?

b) Which are the double cross-overs?

c) Calculate the map distance between each gene.

(Thank you in advance)

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Answer #1

A) The greater number are of parental type offspring. The Black, purple, curved and wild-type are parental type offspring. The genotype of trihybrid parent is b p c/ B P C.

The test crossed parent genotype is b p c / b p c

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B) The lowest number are of double cross over type Purple and black, curved are double cross over.

C) The middle gene is swapped during the double cross over. Please look in image for solution:

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