# Allelic Frequencies & Population genetics

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• Created by: J.E.C.
• Created on: 17-04-14 15:48
Define gene pool?
All the alleles of all the genes of all the individuals in a population at any one time.
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Define allelic frequency?
Number of times an allele occurs within the gene pool.
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In any population, the number of alleles is taken to be...?
1.0
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Give the five conditions of the Hardy-Weinberg principle?
1. No mutations 2.Population is isolated 3. No selection 4. Large population 5.Mating within population is random
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The frequency of the dominant allele tends to be represented by...?
p
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The frequency of the recessive allele tends to be represented by...?
q
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How would you write the equation to determine allele frequency?
p² + 2pq + q² = 1.0
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p + q =
1.0
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If a particular characteristic was the result of the recessive allele, then the frequency is represented by __. If one in 25,000 people has the characteristic how would you determine the frequency of the allele in the population.
q². 1/25000 = q². q = 0.00063. p = 1.0 - 0.00063 = 0.9937. Heterozygous = 2pq = 0.0125. 313 in 25000 carry the allele for the characteristic.
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## Other cards in this set

### Card 2

#### Front

Define allelic frequency?

#### Back

Number of times an allele occurs within the gene pool.

### Card 3

#### Front

In any population, the number of alleles is taken to be...?

### Card 4

#### Front

Give the five conditions of the Hardy-Weinberg principle?

### Card 5

#### Front

The frequency of the dominant allele tends to be represented by...?