Genetic Fruit flies!!!!

[ckk81]

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

 

[Ryan]

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.

 

[richardycc]

ooops actually, its WwHh X Wwhh, you do the crossing.

 

[ckk81]

Its all good, thanks you anyway~ :beer: :beer: :beer: :beer: :beer:

 

[ckk81]

Originally posted by: richardycc
ooops actually, its WwHh X Wwhh, you do the crossing.

:beer::thumbsup:

 

[ckk81]

bump~

 

[Wallydraigle]

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.

 

[virtueixi]

Originally posted by: richardycc
ooops actually, its WwHh X Wwhh, you do the crossing.

 

[AFB]

Wow, just wow.

 

[NoReMoRsE]

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

 

[EvilYoda]

ahhhh, Bio AP. That was fun, except for the crap that you used to knock out the flies...nasty sh*t.