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प्रश्न
How is Hardy-Weinberg’s expression “(p2 + 2pq + q2) = 1” derived?
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उत्तर
Sum total of all the allelic frequencies is 1. Let there be two alleles A and a in a population. The frequencies of alleles A and a are ‘p’ and ‘q’ respectively.
The frequency of AA individuals in a population is p2 and it can be explained that the probability that an allele A with a frequency of p would appear on both the chromosomes of a diploid individual is simply the product of the probabilities, i.e., p2.
Similarly, the frequency of aa is q2 and that of Aa is 2pq.
(p2 + 2pq + q2) = 1 where p2 represents the frequency of the homozygous dominant genotype, 2pq represents the frequency of the heterozygous genotype and q2 represents the frequency of the homozygous recessive.
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संबंधित प्रश्न
Very short answer question.
State the Hardy – Weinberg equilibrium.
How does Hardy-Weinberg’s expression (p2+2pq+q2=1) explain that genetic equilibrium is maintained in a population? List any four factors that can disturb the genetic equilibrium.
Explain how mutations, natural selection and genetic drift affect Hardy Weinberg equilibrium.
Disturbance of Hardy - Weinberg equilibrium results in
Which type of selection explains industrial melanism observed in moth, Biston bitularia?
The graphs below show three types of natural selection. The shaded areas marked with arrows show the individuals in the population who are not selected. The dotted vertical lines show the statistical means.
 |
 |
 |
| character Graph A |
character Graph B |
character Graph C |
- What names are given to the types of selection shown in graphs A, B and C?
- After the selection has operated for several generations in the above populations indicated as, Graph A, B and C, graphically illustrate the probable results.
State Hardy Weinberg's principle.
Give a mathematical expression for Hardy Weinberg's principle.
A population of 200 fruit flies is in Hardy Weinberg equilibrium. The frequency of the allele (a) 0.4. Calculate the following:
The number of carrier fruit flies.
Why are alleles present in homozygous recessive organisms exposed to environmental selection?
