Question

4) In a colony of gerbils that were used for genetics research, I was interested in two coat color genes. One gene causes gerbils to be brown (B-) or black (bb). The other is called dilution and it causes colors to look lighter. For example, genetically black gerbils that are also dd look grey, genetically brown but dd gerbils are called "cinnamon". I had the following gerbils: 35 grey 24 black 22 cinnamon 12 brown I acquired another litter of gerbils. They were 5 brown 3 cinnamon 5 black 3 grey A. What is the frequency of the Band b alleles of my colony after the new gerbils were added?

Answer 1

38 z +3 Grey (bb dd) 35 Black (bb) 24 +5 29 Cinnamon a dd) 22 25 + 3 Brown 12 + 5 17 (B_) Total = 109

A.

0 Brown. coat color caused by "BB" of "Bb" gomotype.. bb" genotype is responsible for black coat-color. If "dd" present with "bb" it will create grey coal color, we know, where, Þ= Dominant Þ+ g = 1 allele frea. allele free P² Dominant → P2+2 +9+92=1 Genotype frequency eq² = Recessive Genotype frequeney. Frequency of "bb" genotype, 38 +29 109 q2 = 0.614 qz Recessive (P+q)² = (1/² q² = qa 0.78 . Р þ= 1.78 = 22 So Frequency of 'B'allele is 0.22 and frequency of 'b'allele is 0.78.

B.

ed ". genotype is responsible for grey and brown phenotype. So, freemaney of genotype, -2 " I do q2 = 38 +25 109 0.577 q z 2 0.75 - P21 -0.75 = 0.25 Frequency of "Dallele is 0.25 and frequency of "d-allele-is 0.75.