The Chinese Alligator (Alligator sinensis; above) is a critically endangered species living in a restricted reserve area in the Yangtze River in China’s Anhui province. (Captive populations are doing much better; where individuals may live up to 70 years).
(3 pts) After spraying an insecticide the number of individuals of each genotype that survived is given below. Calculate the absolute fitness, and relative fitness of each genotype. Round up the answers to three decimal points.
|
Genotype |
Number of individuals survived |
|
AA |
50 |
|
Aa |
18 |
|
aa |
15 |
From the given data,
Assuming that the population size is 500, the number of alleles is = 1000
The frequency of A = frequency of AA + 1/2 frequency of Aa = 50/83 + 1/2 (18/83) = 0.71
The frequency of a = frequency of aa + 1/2 frequency of Aa = 15/83 + 1/2 (18/83) = 0.288
The expected frequencies are,
AA = 0.71*0.71 = 0.5041; number of alleles is = 0.504*1000 = 504
Aa = 0.71* 0.288 = 0.204; number of alleles is = 0.204*1000 = 204
aa = 0.288*0.288 = 0.082; number of alleles is = 0.288*1000 = 288
The absolute fitness is,
AA: 50/504 = 0.099
Aa: 18/204 = 0.088
aa: 15/288 = 0.052
The relative fitness is,
AA: 0.099/0.099 = 1
Aa: 0.088/0.099 = 0.88
aa: 0.052/0.099 = 0.525
The Chinese Alligator (Alligator sinensis; above) is a critically endangered species living in a restricted reserve...
The Chinese Alligator (Alligator sinensis; above) is a critically endangered species living in a restricted reserve area in the Yangtze River in China’s Anhui province. (Captive populations are doing much better; where individuals may live up to 70 years). a. (2 pts) If, during four consecutive years the population was sampled and its population size was 200, 100, 50 and 10, what is the effective population size (Ne) of this population? Show your work.