Please explain in details: White eyes is an X-linked recessive mutation and curly wings is an...
Please explain in details:
White eyes is an X-linked recessive mutation and curly wings is an autosomal dominant mutation in Drosophila. What proportion of red eyed, curly winged females is expected in the F2 starting with a true breeding white eyed, non-curly female mating with a true breeding red eyed curly male.
| a. |
1/16 |
|
| b. |
1/8 |
|
| c. |
3/8 |
|
| d. |
3/16 |
|
| e. |
1/32 |
Homework Answers
let the alleles be Xw= white eyes, Xw+= red eyes C- curly wings, c- non- curly wings
white eyed, non-curly female * red eyed curly male.
XwXwcc * Xw+YCC
| Xw+C | YC | |
| Xwc | Xw+XwCc | XwYCc |
Xw+XwCc * XwYCc
| Xw+C | Xw+c | XwC | Xwc | |
| XwC | Xw+XwCC (red eyes, curly wings, female) | Xw+XwCc(red eyes, curly wings, female) | XwXwCC (white eyes, curly wings, female)) | XwXwCc(white eyes, curly wings, female) |
| Xwc | Xw+XwCc(red eyes, curly wings, female) | Xw+Xwcc (red eyes, non-curly wings, female) | XwXwCc(white eyes, curly wings, female) | XwXwcc(white eyes, non-curly wings, female) |
| YC | Xw+YCC (red eyes, curly wings, male) | Xw+YCc(red eyes, curly wings, male) | XwYCC(white eyes, curly wings, male) | XwYCc(white eyes, curly wings, male) |
| Yc | Xw+YCc(red eyes, curly wings, male) | Xw+Ycc(red eyes, non-curly wings, male) | XwYCc(white eyes, curly wings, male) | XwYcc (white eyes, non-curly wings, male) |
proportion of red-eyed, curly winged females= number of red-eyed, curly winged females/ total number=3/16
so the answer is
d) 3/16
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