Backgroud: I collected data on my howler monkeys and found that of 200 monkeys,

Question

Backgroud:

I collected data on my howler monkeys and found that of 200 monkeys, 30 had large testicles, 70 had medium-sized testicles, and 100 had small testicles. Provide answers to the following, showing your work. Assume that the gene T is responsible for testes size, and follows incomplete dominance. A chi-square distribution table is provided at the end of this page.

Question:

Part A. What are the genotype frequencies of the three different monkey testes genotypes?

Part B. What are the allele frequencies of monkey testes size gene?

0.25, 0.5, 0.25

Part C. Which of the monkey testes alleles is the dominant one

A. neither

B. the allele for small testes

C. Large Testes

A. 0.03, 0.07, 0.9 Percentage Points of the Chi-Square Distribution Degrees of Probability of a larger value of x 0.99 0.95 0.90 0.75 0.10 0.01 0.50 0.455 0.020 0.103 0.211 .5751.386 0.115 0.32 0.584 1.212 2.366 1064 .923 3.357 0.05 3.84 5.99 7.81 949 1.07 15.09 12.59 14.07 4.11 11.34 0.297 0.554 0.711 1.145 7.78 9.24 0,64 13.28 1.610 2.675 4351 6.63 2.204 2.833 3.455 4.255 5.348 6.346 7.84 2.167 2.733 18.48 3.490 .071 7.344 10.22 13.3 15.51 20.09 3.325 4.168 5.899 8.343 11.39 14.68 16.9 21.67 12.55 15.99 18.31 23.21 5.578 7.584 10.341 13.70 17.28 19.68 24.72 21.03 26.22 27.69 4.660 6.571 7.790 10.165 13.339 17.12 21.06 23.68 29.14 8.547 11.037 14.339 18.25 22.3 25.00 30.58 812 7.96 9.312 11.912 15.338 19.37 23.54 26.30 32.00 8.672 10.085 12.792 16.338 2049 24,77 27,59 33.41 9.390 10.865 13.675 17.338 21.60 25.99 2734.80 7.633 10.117 11.651 14.562 18.338 22.72 27.20 30.14 36.19 31.41 37.57 26.04 30.81 33.9 40.29 10856 13.848 15.659 19.037 23.337 28.24 33.20 36,42 42.98 12.138 15.379 17.292 20.843 25.336 30,43 35.55 38.89 45.64 13.565 16.928 18.939 22.657 27.336 32.62 37.92 41.34 48.28 14.953 18.493 20.599 24.478 29.336 34.80 0.2 43.77 50.89 22.164 2509 29.051 33.660 39.335 45.62 51.80 55.76 63.69 27.707 34.764 37.689 42.942 49.335 56.33 63.17 67.5076.15 1.647 2.088 2.558 3.940 4.865 6.7379.342 3.053 4.57 5.226 11.340 14.85 15.98 4.107 7.042 9.299 12.340 2.36 5.229 7.261 6.408 8.260 10.851 12.443 15.452 19.337 23.83 28.41 .542 12.338 14.041 17.240 21.337 2 37.485 43.188 6.459 52.294 59.335 65.98

Explanation / Answer

As, it is the case of incomplete dominance, the phenotype directly represents genotype

Let the for large testicle = T, small testicle = t,

Genotype for large sized testicle = TT

Genotype for small sized testicle = tt

Genotype for medium sized testicle = Tt

Ques 1 Genotypic frequencies

Answer 1: Genotypic frequency = Population with that genotype/total population

Genotypic frequency of large testicles (TT) = 30/200 = 0.15

Genotypic frequency of medium testicles (Tt) = 70/200 = 0.35

Genotypic frequency of small testicles (tt) = 100/200 = 0.5

So, correct answer is option C

Ques 2 Allele frequencies

Answer 2: Allele frequency (T) = Frequency of TT + 1/2(Frequency of Tt)

Allele frequency (T) = 0.15 + 1/2(0.35) = 0.325

Allele frequency (t) = Frequency of tt + 1/2(Frequency of Tt)

Allele frequency (t) = 0.5 + 1/2(0.35) = 0.675

Correct Option is option B

Ques 3 Which of the monkey testes alleles is the dominant one?

Answer 3: Correct answer is option A Neither

Because it is a case of incomplete dominance and so, neither of two are dominant.

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