Normal eye color in flies is red. Mutant flies have brown eye color. Similarly, normal wing...
Normal eye color in flies is red. Mutant flies have brown eye color. Similarly, normal wing length is long. Mutant flies have short wings.
A female true breeding fly with brown eyes and short wings is crossed with a true breeding male with red eyes and long wings.
In the F1 the female flies are red eyed and long winged. The male flies are red eyed and short winged.
F1 males are crossed to F1 females
Both sexes of F2 progeny flies have phenotypes as shown:
30 red eyes long wings
30 red eyes short wings
10 brown eyes long wings
10 brown eyes short wings
Describe the Genotype of the male and female parents.
Deduce the inheritance of each Phenotype.
Homework Answers
Answer:
Based on the information, eye color is autosomal and wing size is X-linked trait.
A female true breeding fly with brown eyes and short wings = XsXs; rr
True breeding male with red eyes and long wings = XSY; RR
XsXs; rr (female) x (male) XSY; RR ---Parents
|
XS R |
Y R |
|
|
Xs r |
XSXs; Rr (long wings, red eye female) |
XsY; Rr (short wing, red eye male) |
XSXs; Rr (long wings, red eye female) x (short wing, red eye male) XsY; Rr ---Parents
|
Xs R |
Xs r |
Y R |
Y r |
|
|
XS R |
XSXs; RR (Long wing, red eyes-female) |
XSXs; Rr (Long wing, red eyes-female) |
XSY; RR (Long wing, red eyes-male) |
XSY; Rr (Long wing, red eyes-male) |
|
XS r |
XSXs; Rr (long wing, red eye-female) |
XSXs; rr (short wing, brown eye-female) |
XSY; Rr (long wing, red eye-male) |
XSY; rr (long wing, brown eye-male) |
|
Xs R |
XsXs; RR (short wing, red eye-female) |
XsXs; Rr (short wing, red eye-female) |
XsY; RR (short wing, red eye-male) |
XsY; Rr (short wing, red eye-male) |
|
Xs r |
XsXs; Rr (short wing, red eye-Female) |
XsXs; rr (short wing, brown eye-Female) |
XsY; Rr (short wing, red eye-male) |
XsY; rr (short wing, brown eye-male) |
F2:
|
Phenotype |
Male |
Female |
|
Long wing, Red eye |
3/8 |
3/8 |
|
Long wing, brown eye |
1/8 |
1/8 |
|
Short wing, Red eye |
3/8 |
3/8 |
|
Short wing, brown eye |
1/8 |
1/8 |
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