Question

I need help with understand how the Hardy-weinberg Principle works

Answer 1

i have a project that i need help with too

Answer 2

The Hadry-Weinberg Law predicts how gene frequences will be transmitted from generation to generation, given some assumptions - if an infinitely large,random mating population is free from migration, mutation, natural selection etc, te gene frequencies won't change and the frequences will be p2 for AA genotype, 2pq for Aa genotype and q2 for aa genotype in the next generation.
There is not such thing as the infinitely large population, but it doesn't negate the principle. The effect of concern is genetic drift, which is change in gene frequency resulting from a deviation from expected genotypic frequencies.
Random mating is matings in a population that occur in proportion to their genotypic frequencies.
One of the predictions of the Hardy-Weinberg Law refers to the genotypic frequencies after one generation of random mating.
The second prediction is that the frequencies of the two alleles will remain the same from generation to generation.

Answer 3

Thanks

Answer 4

Sure :)

Answer 5

How do i calculate the frquences of the dominat and recessive alleles using this for say for people who can roll their tongue verse people who can not. ( 24/30 for yes ) (6/30) for no

Answer 6

The Castle-Hardy-Weinberg equation says that p^2+2pq+q^2 = 1, where p is the proportion of homozygous dominant individuals, pq is the proportion of heterozygotes and q is the proportion of homozygous recessive individuals.

If you take the allele for not rolling the tongue to be q^2, then you can figure out q itself. That is the frequency of the recessive allele in the population.

Once you have q, you can substitute it into the CHW equation and solve it for p. That will give you the frequency of p.

Clear?