Question

The table shows the crossing-over frequencies for three genes in the fruit fly Drosophila. The greater the frequency, the more likely that crossing over separates the genes. The gene for eye color (A), wing shape (B), and body color (C) are found on the same chromosome.

Genes | Crossing over frequency
A and B | 12.5%
A and C | 6%
B and C | 18.5%


What are the two most likely sequences of these genes on a gene map for this chromosome? Select two options

a. B,A,C

b. A,B,C

c. C,B,A

d. C,A,B

Answer 1

Answer:

B, A, C, and C, A, B (another way to say it would be letters a and d).

Explanation:

I took the quiz and got it right.

Answer 2

The two most likely sequences of these genes on a gene map for this chromosome is :

A) B,A,C

D) C,A,B

• The two most likely sequences of these genes on a gene map for this chromosome is B,A,C and  C,A,B.
• A gene is the basic physical and functional unit of heredity.
• The genetic map is a type of chromosomal map that shows the relative location of genes and other important characteristics.

Thus, the correct answer is A and D.

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