Question

Suppose that you have a population of rabbits whose nose size is determined by a single gene, N.  NN animals have large noses, Nn animals have medium noses, and nn animals have small noses.  Your population begins with the following distribution of nose sizes:

Large noses: 16

Medium noses: 80

Small noses: 104

5A) What are the allele frequencies in the population?

1. f(N) = 0.28, f(n) = 0.72
2. f(N) = 0.24, f(n) = 0.76
3. f(N) = 0.20, f(n) = 0.80
4. f(N) = 0.16, f(n) = 0.84

5B) For each situation below, pick the result that best describes what you would expect to see in the overall population of rabbits in the future. (3 points each).

Situation 1: There is positive assortative mating between rabbits.

Situation 2: There is negative assortative mating between rabbits.

Situation 3: Large noses are a disadvantage in attracting a mate.

Situation 4: Large noses are an advantage in detecting the presence of predators.

Situation 5: The population of rabbits becomes subdivided, with more large-nosed rabbits moving south, and more small-nosed rabbits moving north.

1. The frequency of homozygous animals will increase.
2. The frequency of homozygous animals will decrease.
3. The frequency of large-nosed rabbits will increase.
4. The frequency of large-nosed rabbits will decrease.

Answer 1

e Large roses (NN) = 16 Medium noses (N2) = 80 small roses (nn) = 104 Total = 200 Geenotypic frequency of NN = 266 = 0.08 Genotypic Frequency of Nr = 80 = 0.4 Geenotypic Frequency of not = 109 = 0.52 Gene frequency of N in population = 0.08 + Ź x0.4 = 0-28 Geene Frequency of an in population = 0.52x + 2 x Cod = 072 5. A) @ F (N) = 0.28, F (N) = 0,72 IRI Situation 1: assortative mating There is positive between rabbits. Expected to see it a. The frequeney of homozygous animals will increase.

Explanation: Possible parent matting Patterns Expected offspring genotypes A NN No Rn NN XNN Nr x NR - nn xnn Total » 5 42% Total homozygous animal = 84% Sification 2 : There is negative assor fativë matting between rabbits Expected to see: b. The frequency of homozygous animals will decrease. Explanation: Possible parent matting Patterns I expected offspring genotypes 22 N3 NN X NR NN XnR NR x nr 2 Total & v po IT% 67% Totat heterogous animal = 67%

situation 3: Large nose are disadvantage in attracting a mate: Expected to see & d. The frequency of large-nosed rabbits will decrease. Exploration : no matting will observe betwen NN NN leads to decrease in Frequency of large nosed sabbits in Pulare. Situation 4: Lorge nose are an advantage in detecting the presence of predators, Expected to see c. The Frequency of lege-nose rabbits will increase. Explanation: free nose rabbits will more sweivived than small nose rabbits cause they got more Pood than Sonall - nose sabbits. so, they got fa roue From Natural selection

situation 5: The population of rabbits becomes sub diveded with more large rosed sabbits moving south and more small nosed rabbits moving north Expected to see : a. The Frequency of homozygous - animal will increase. This subdivision will pavor in Explanation : assortative mating.