Cat coat color is controlled by an X-linked gene with two alleles: XB= Black and XO...

Cat coat color is controlled by an X-linked gene with two alleles: X^B= Black and X^O = Orange. A population of cats in Tampa was found to consist of the following phenotypes:

	Black	Orange	Calico	Totals
Males	311	42	0	353
Females	277	7	54	338

Calculate the allelic frequency using all of the available information.

Solutions

Expert Solution

First the males=

There are 311 black male cates, so here we have 311 XB alleles, as the males only have on X chromosome and this gene is link to this chromosome.

There are 42 orange male cates, so here we have 42 XO alleles.

Second the females=

There are 277 black females cats, so we have 554 XB alleles, because the female have two X chromosome and the gene is link to this chromosome, now we have to multiply 277*2 to obtain 554.

Then, there are 7 orange female cats, the same happens, the females has two X chromosomes so it is 7*2=14. There are 14 XO alleles

Finally, there are 54 calico female cats (that have orange and black, so they have both chromosmes), so here we have 54 XB alleles and 54 XO alleles.

Total of alleles=

XB= 311+554+54=919

XO=42+14+54=110

To calculate the allelic frequency we have to divide each total of alleles with the total of alleles. The total of these alleles are obtain these way= 353 +676=1029. 353 because this is the total of alleles in the males, as they only have one X chromosome. 676 as we have to consider the double of females (338*2) as the females have two X chromosomes.

Allelic frequency=

XB=919/1029=0.893

XO=110/1029=0.106

gladiator answered 1 year ago

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