Genotype and Allele Frequencies

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

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Jason123456
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Genotype and Allele Frequencies

Post by Jason123456 » Sun Dec 09, 2007 6:10 am

I was wondering if ya'll could help me with.

In a particular breed of cats, black fur(BB or Bb) is dominant and white fur (bb) is recessive. In a population of 500 cats, 180 are homozygous dominant(BB) 240 are hetrozygous (Bb) and 80 are homozygous recessive (bb),

What is the genotype frequencies of BB, Bb, and bb

Also, what are the allele frequences of B and b

Thanks for any help with this.

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mith
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Post by mith » Sun Dec 09, 2007 4:57 pm

I think this is a simple counting exercise if you know what the terms mean.
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Jason123456
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Post by Jason123456 » Sun Dec 09, 2007 5:11 pm

So would it be

Genotype frequency?

BB = 180/500
Bb= 240/500
bb= 80/500

Allele frequency?

B= 600/1000
b = 400/1000

?????????????? Thanks!

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MrMistery
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Post by MrMistery » Sun Dec 09, 2007 8:28 pm

yes that is correct, but in population genetics gene frequencies are expressed as decimals where sum of the frequencies of all alleles is 1. in your case B+b=1.
Therefore B=600/1000=0.6
b=400/1000=0.4
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