In a population of tropical frogs, a certain locus determines the size of an ind
ID: 148461 • Letter: I
Question
In a population of tropical frogs, a certain locus determines the size of an individual. With respect to this locus, homozygous dominant and heterozygous frogs are large while homozygous recessive frogs are small. Estimated numbers of the three genotypes are: AA 502, Aa 398, and aa 100. (A) Calculate the starting frequencies of the 3 genotypes and the 2 alleles(B) What is the selection coefficient against small individuals in this population? Bigger males usually have higher reproductive success, relative to smaller males, because they are able to produce calls of lower sound frequency that are more attractive to females. Also, due to their larger size, they have a higher survival rate than small individuals. (C) Calculate the allele frequencies (pi and qu) for the next generation of frogs ("next generation" the offspring of the individuals in the table below). Remember, we are violating only the assumption of "no selection". So when mating occurs, it is random Number offspring/individual survival to adulthood large (AA) 604 8 large (Aa) 299 8 small (aa) 97 6 20% 20% 15%Explanation / Answer
Answer:
Data Given:
Large Frogs: AA=502
Large Frogs: Aa=398
Small Frogs: aa=100
Total Population Size: 502+398+100=1000
Case 1: Calculation of genotype frequency:
The genotype frequency can be calculated by simply dividing the number of individuals of a particular genotype to total population size:
Genotype Frequency of AA: 502/1000= 0.502
Genotype Frequency of Aa: 398/1000= 0.398
Genotype Frequency of aa: 100/1000= 0.100
Case 2: Calculation of allelic frequency:
The allelic frequency can be calculated by adding the genotype frequency of that particular allele:
Allelic frequency of A: 0.502 + (0.502 X 0.398) = 0.701
Allelic frequency of a: 0.100 + (0.502 X 0.398) = 0.299
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