Biology, 13.10.2019 05:20 carlosatniel47

Afruit fly population has a gene with two alleles, a1 and a2. tests show that 70% of the gametes produced in the population contain the a1 allele. if the population is in hardy-weinberg equilibrium, what proportion of the flies carry both a1 and a2? a fruit fly population has a gene with two alleles, a1 and a2. tests show that 70% of the gametes produced in the population contain the a1 allele. if the population is in hardy-weinberg equilibrium, what proportion of the flies carry both a1 and a2? 0.7 0.09 0.21 0.42 0.49

Answers: 3

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Answer from: m3lissa

The answer is 0.42.

According to the Hardy-Weinberg equilibrium:
p + q = 1
p² + 2pq + q² = 1
where p is a frequency of a1 allele, q is a frequency of a2 allele, p² is a frequency of a1a1 genotype, 2pq is a frequency of a1a2 genotype, q² is a frequency of a2a2 genotype.

If 70% of the gametes produced in the population contain the a1 allele, then:
p = 70% = 0.7.
If p = 0.7 and p + q = 1, then q = 1 - p = 1 - 0.7 = 0.3

So, the proportion of the flies that carry both a1 and a2 (a1a2 genotype) is:
2pq = 2 * 0.7 * 0.3 = 0.42

Answer from: nicolemaefahey

Hardy Weinberg principle in genetics asserts that in the lack of evolutionary influence the alleles or the recurrence of genotypes will be unchanged.

It is calculated by using the formula:

p²+2pq+q²=1

Where,

frequency of dominant purebred = p²frequency of heterozygous= 2pqfrequency of recessive purebred = q²

The correct answer is:

option D. 0.42

The explanation for this is:

p+q=1

Where,

p: frequency of a1 allele q: frequency of a2 allele p²: frequency of a1a1 genotype 2pq: frequency of a1a2 genotype q²: frequency of a2a2 genotype.

70% of the given population contains a1 allele so,

p= 70% = 0.7

If p=0.7 and p+q=1

Then,

q = 1 - p

= 1 - 0.7

= 0.3

Hence the population of the flies that carries a1a2 genotype will be:

= 2pq

= 2 × 0.7 × 0.3

= 0.42

Therefore, the population of flies containing both a1 and a2 alleles is 0.42.

To learn more about Hardy-Weinberg equilibrium follow the given link:

link

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Afruit fly population has a gene with two alleles, a1 and a2. tests show that 70% of the gametes pro...