A population of 100 fish in an aquarium consists of 49 homozygous dominant green individuals, 42 heterozygous green individuals, and 9 white individuals. What are the frequencies of the three genotypes on the population? What are the frequencies of the green and white alleles in the gene pool?

Question

anonymous · Answer

i have the 3 genotypes:
The frequencies of the 3 genotypes are: 49AA, 42Aa, and 9aa

anonymous · Answer

its the decond question

alexandervonhumboldt2 · Answer

49 FF individuals = 98 F alleles 
42 Ff individuals = 42 F alleles and 42 f alleles 
9 ff individuals = 18 f alleles 
--------------------------------------... 
100 individuals total = 200 alleles total 

a.) to find the frequency of a given genotype, divide the number of individuals of that genotype by the number of individuals in the population. 
Ex: # of homozygous dominant green fish/total number of fish --> 49/100 

b.) to find the frequencies simply divide the number of a given allele type by the number of total alleles in the population. 

Ex: F frequency = # of F/total --> 140/200 

c.) if the population is in hardy weinberg equilibrium, it will follow the equation: 
p^2 + 2pq + q^2 = 1 
Use the frequency of F for p, and f for q. 
the terms p^2, 2pq, and q^2 will give you the genotype frequencies for the next generation of fish. 

p^2 = homozygous dominant 
2pq = heterozygotes 
q^2 = homozygous recessive

anonymous · Answer

where does the 98 alleles
42 alleles and 42 alleles come from?