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Genetic Fruit flies!!!!

C

ckk81

Senior member
i checked my biology books but really didn't understand what its telling me. please someone will give me some pointers, thank you.

In fruit flies, vestigial wings and a hairy body are produced by 2 recessive genes located on different chromosomes. The wild alleles, longs wings and hairless body, are dominant.

What are expected phenotypic ratios from a cross of a fly that is heterozygous for both traits with fly that is heterozygous for wings but has the NON-Wild type body? Show the cross if possible.


thanks,
Jack
 
You know what, I used to know how to do this - but because I, like most people, have never used phenotypic ratios ouside of Biology class, I have forgotten.
 
It tells you what's dominant and what's recessive. Can't you just draw a Punnet square and fill in the sections? I'm pretty sure I remember doing that exercise as a freshman in highschool.
 
Different chromosomes so no recombination.

I'm assuming everything's autosomal.

Wings: W = normal, w = vestigal
Body: B = normal, b = hairy

WwBb x Wwbb -->

WWBb - 0.125 - normal wings, normal body
WWbb - 0.125 - normal wings, hairy body
WwBb - 0.25 - normal wings, normal body
Wwbb - 0.25 - normal wings, hairy body
wwBb - 0.125 - vestigal wings, normal body
wwbb - 0.125 - vestigal wings, hairy body

So phenotypic ratios:

Normal wings, normal body: 0.375
Normal wings, hairy body: 0.375
Vestigal wings, normal body: 0.125
Vestigal wings, hairy body: 0.125
 
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