please explain your reasons for the correct answer. 4. Drosophila have two genes
ID: 11938 • Letter: P
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please explain your reasons for the correct answer.4. Drosophila have two genes y (yellow body) and car (carnation eyes). Doubly heterozygous females (y+ car+/y car) are mated to hemizyogous recessive males, and 50% percentage of the male progeny from such a female are be recombinant for y and car. Which of the following statements is correct?
A. y and car are the same chromosome and 50 m.u. apart
B. y and car are the same chromosome and more than 50 m.u. apart.
C. y and car are on different chromosomes.
D. y and car are on different chromosomes or are on the same chromosome and more than 50 m.u. apart.
E. none of the above are correct.
5) If I tell you that genes A and B are on the same chromosome and 70 map units apart, how did I determine this?
A) I did a cross and got 70% recombination between the two genes
B) I did a cross and got 35% recombination between the two genes
C) I did a cross and got 70% gene conversions
D) I did a cross and genes A and B showed both 35% recombination with gene C.
E) None of the above are correct.
Explanation / Answer
4. Drosophila have two genes y (yellow body) and car (carnation eyes). Doubly heterozygous females (y+ car+/y car) are mated to hemizyogous recessive males, and 50% percentage of the male progeny from such a female are be recombinant for y and car. Which of the following statements is correct?
A. y and car are the same chromosome and 50 m.u. apart
B. y and car are the same chromosome and more than 50 m.u. apart.
C. y and car are on different chromosomes.
D. y and car are on different chromosomes or are on the same chromosome and more than 50 m.u. apart.
E. none of the above are correct.
5) If I tell you that genes A and B are on the same chromosome and 70 map units apart, how did I determine this?
A) I did a cross and got 70% recombination between the two genes
B) I did a cross and got 35% recombination between the two genes
C) I did a cross and got 70% gene conversions
D) I did a cross and genes A and B showed both 35% recombination with gene C.
E) None of the above are correct.
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