Question

The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy (h) body. Assume that a cross is made between a fly with normal wings and a hairy body and a fly with vestigial wings and normal body hair. The wild-type F1 flies were crossed among each other to produce 1024 offspring. What phenotypes would you expect among the 1024 offspring?

How many of each phenotype would you expect?

Answer 1

Normal wing & normal body : normal wing & hairy body : vestigial wing & normal body : vestigial wing & hairy body

Step-by-step explanation:

Parents normal wings & hairy body X vestigial wing & normal body

GGhh ggHH

gamets Gh gH

F1 GgHh (self cross)

normal wing & normal body

GH Gh gH gh

GH GGHH(normal wing GGHh(normal GgHH(normal GgHh(no-

normal body) wing&normal wing and normal rmal win-

body) body) g and

normal

body)

Gh GGHh(normal wing GGhh(normal GgHh(normal Gghh(no-

& normal body) wing & hairy wing & normal mal wing

body) body) and hairy

body

gH GgHH(normal wing GgHh(normal ggHH(vestigial ggHh(ve-

& normal body) wing & normal wing & normal stigial wi-

body) body) ng & nor-

mal body)

gh GgHh(normal wing Gghh(normal ggHh(vestigal gghh ggHh

& normal body) wing & hairy wing & normal (vestigal

body) body) wing & hai-

ry body)

Phenotypic ratio : 9:3:3:1

normal wing & normal body : normal wing & hairy body : vestigial wing & normal body : vestigial wing & hairy body

576 : 192 : 192 : 64

Total progeny: 1024

576 : 192 : 192 : 64

Total progeny: 1024