Quick 10Q: Hardy Weinberg

Front

What is the Hardy-Weinberg principle?

Back

The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of evolutionary influences.

Front

What is the equation for allele frequencies in a population?

Back

p + q = 1, where p is the frequency of the dominant allele and q is the frequency of the recessive allele.

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How do you calculate the frequency of homozygous recessive individuals?

Back

The frequency of homozygous recessive individuals is calculated as q^2, where q is the frequency of the recessive allele.

Front

If the frequency of the recessive allele is 0.2, what is the frequency of homozygous recessive individuals?

Back

0.04 (0.2^2 = 0.04).

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What does it mean if a population is in Hardy-Weinberg equilibrium?

Back

It means that the population's allele frequencies are not changing over time, indicating no evolution is occurring.

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What factors can disrupt Hardy-Weinberg equilibrium?

Back

Factors include mutation, migration, genetic drift, non-random mating, and natural selection.

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If the frequency of the dominant phenotype is 0.36, how do you find the frequency of the dominant allele?

Back

Use the equation p^2 + 2pq = frequency of dominant phenotype. Solve for p.

Front

What is the significance of the Hardy-Weinberg equation in genetics?

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It provides a mathematical model to study genetic variation in a population and predict allele frequencies.

Front

How do you determine the frequency of a recessive allele from phenotypic ratios?

Back

Use the formula q = √(frequency of homozygous recessive individuals).

Front

If a population has 400 red flowers, 200 pink flowers, and 100 white flowers, how do you find the frequency of the recessive allele?

Back

Calculate the total number of flowers, determine the number of homozygous recessive individuals, and use q = √(frequency of homozygous recessive individuals).