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Genetics - Drosophila

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Genetics - Drosophila

Postby Darwin420 » Fri Mar 13, 2009 9:36 pm

Hey guys, I hate coming on this site and asking for help, but I have no other resort... I really don't know what to do ( I haven't been keeping up with genetics.)

Ok so I am given a sample of F2 generation of fruit flies bred by two true breeding flies.
Here are the pop numbers

Wild type, males -87
wild type, females - 171
Orange eyes, males 27
Orange eye females 51
black body, males 96
Orange eyes, black body, males 18

I can't really come up with a hypothesis on how these traits are linked.

As we look at wild type males vs wild type female we see that there is roughly a 50% difference in frequency. So right there means these traits aren't fully independent and something is most likely sex linked.

If we look we will see that only males have a black body which can represent two things: the trait is Y linked OR the trait is X linked.

I don't know what to do!!

I need help to generate a hypothesis and figure out the expected ratios so I can use a chi test to figure out the validity of my hypothesis.

Can someone please help me set this up? I am behind in this class ..ahhhhhhhh.


p.s. I hate asking someone to help me but I have no other option.

thanks
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Postby mith » Fri Mar 13, 2009 10:58 pm

trial and error, make a table of their percentages
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
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Postby Darwin420 » Fri Mar 13, 2009 11:04 pm

Yea...I have been doing that....nothing is working.
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Postby MrMistery » Sun Mar 15, 2009 9:24 pm

i think you need to employ a chi squared analysis..
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
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Postby Darwin420 » Mon Mar 16, 2009 5:51 pm

Yea...I figured it out, thanks.
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