Imagine Drosophila genes C, D, and E are autosomal genes located close to each other on the same chromosome (same assumptions as the first problem). You cross a C D E homozygote with a c d e homozygote, then cross the F1 females with a c d e homozygous male. Of 400 progeny, you observe the following phenotypes: 135 CDE 139 cde 22 cDE 18 Cde 42 CdE 38 cDe 3 cdE 3 CDe a. What is the order of the genes? Calculate the distance between genes and draw a map to get the final answer. Question 2 options: 1.CED 2. DEC 3. ECD 4. DCE
Imagine Drosophila genes C, D, and E are autosomal genes located close to each other on the same chromosome (same assumptions as the first problem). You cross a C D E homozygote with a c d e homozygote, then cross the F1 females with a c d e homozygous male. Of 400 progeny, you observe the following
135 CDE
139 cde
22 cDE
18 Cde
42 CdE
38 cDe
3 cdE
3 CDe
a. What is the order of the genes? Calculate the distance between genes and draw a map to get the final answer.
Question 2 options:
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1.CED |
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2. DEC |
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3. ECD |
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4. DCE |
If many genes are located on the same chromosome then the crossing over between them will be reduced and this crossing over frequency is used to calculate the order of the genes as well as the distance between them.
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