In sock monkeys, lip size is a sex-linked trait where big lips (XB)> small lips
ID: 178681 • Letter: I
Question
In sock monkeys, lip size is a sex-linked trait where big lips (XB)> small lips (XS)> tiny lips (XT). In the first generation, let's call it F1, the allelic frequency for XB is 0.39, XS is 0.33, and XT is 0.28.
The diagram below shows the population genotypes. Let's call 1st generation F2 and second generation F3:
a. Can you chegg experts please calculate the allelic frequencies for all three alleles, and then explain how they compare to F1 allelic frequencies?
b. Also, can you chegg experts please offer an explanation to why there is a difference in allelic frequencies between F1 and F2/F3 generations?
c. Also, can you experts please name the type of selection that took place?
d. Next, if there was no immigration or emigration, and no deaths within the population, can you chegg experts please calculate the relative fitness values for each female genotype?
e. Lastly, waht proportion of each genotype (male AND female) do you chegg experts expect after one more generation of selection?
BvB ByT BvS SvS SvT Genotype 1st Generation 281 55 56 282 51 275 337 335 328 2nd Generation 306 58 58 308 52 298 364 363 352Explanation / Answer
Total population size in F2= 281+55+56+282+51+275+337+335+328= 2000
Total alleles= 2000 x 2= 4000
Frequency of XB allele= 281 x 2 + 55 + 56 + 337 / 4000= 0.2525
Frequency of XT allele= 55 + 51 + 275 x 2 + 328 / 4000= 0.246
Frequency of XS allele= 56 + 282 x 2 + 51 + 335 / 4000= 0.2515
F3 generation
Total population size in F3= 306 + 58 + 58 + 308 + 52 + 298 + 364 + 363 + 352 = 2159
Total alleles= 2159 x 2= 4318
Frequency of XB allele= 306 x 2 + 58 + 58 + 364 / 4318= 0.2528
Frequency of XT allele= 58 + 52 + 298 x 2 + 352 / 4318= 0.245
Frequency of XS allele= 58 + 308 x 2 + 52 + 363 / 4318= 0.2522
So, as compared to F1, the allelic frequencies of all three alleles have reduced and have come to almost a constant level.
Changes in the allelic frequency of F1 and F2/F3 generations might be due to natural selection.
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