When gene frequencies stay relatively constant, Hardy-Weinberg equilibrium occurs. HW equilibrium occurs in large populations with random mating, with no migration, mutation, or natural selection. In this case, the proportion of dominant homozygous equals the square of the frequency of the dominant allele (p2), the proportion of recessive homozygous equals the square of the frequency of the recessive allele (q2<span>) and the proportion of heterozygotes equals 2pq.</span>
Generally speaking, precession is believed to <u>occur as a result of the gravitational forces exerted by the sun and moon as they revolve around the earth.</u> When an object revolves, its axis of rotation exhibits a nodding or swish motion. There is a wobble in the movement of precession. This phenomenon is caused by the gravitational pull exerted by one body upon another, resulting in nutation.
Hope this helps :)
If you stay in the water for too long your hand will shrink