Biology/stats help?

[Nitrik]

Hello all,

I have a biology assignment and this one question I have been having a lot trouble with! I was hoping you can help me.

A class of 75 students was tested for their ability to taste the chemical phenylthiocarbamide (PTC). A total of 48 were found to be tasters, expressing the dominant trait. What is the frequency of the recessive (t) allele in this sample? How frequently would one expect a homozygous nontaster (tt) to date a homozygous taster (TT), if dating were random with respect to this phenotype?

Any help would be appreciated.

 

[arashinho]

It's been a while.
http://userwww.sfsu.edu/~biol240/labs/lab_02hardyweinberg/index.html
Hardy-Weinberg: look it up.
p+q=1
p^2=frequency of homozygous recessive
q^2=frequency of homozygous dominant
p^2+2pq+q^2=1

I hate to leave you hanging but I think you should be able to figure it out from here.

 

[Nitrik]

Thanks a lot! I figured it out!