Give the sum total of all the allelic frequencies in a stable population. List any two factors which disturb the stability of a population. How does this disturbance affect the population?
Answers
Answer:
The sum total of all the allelic frequencies of a stable population is one.
The two factors which affect Hardy-Weinberg's equilibrium are as follows: (Any two)
a. Gene migration: When some individuals of a population migrate to other populations or when certain individuals come into a population (ie. emigration and immigration), some genes are lost in the first case and added in the second.
b. Genetic drift : - Random changes in the allele frequencies of a population occurring only by chance,constitute genetic drift. The change in allele frequency may become so drastically different that they form species.
c. Mutations : - Though mutations are random and occur at very slow rates, they are sufficient to create considerable genetic variation for speciation to occur.
d. Genetic Recombination : - New combinations of genes occur due to crossing over in meiosis during gamete formation.
e. Natural selection : - It is the most critical evolutionary process, that leads to changes in allele frequencies and promotes adaptation as a product of evolution.
Sum total of all the allelic frequencies in a stable population is called gene pool.
Explanation:
- Two factors which disturb the stability of a population
- Gene flow - when individual migrate from one place or other population new genes are added to the new population .
- Mutation- advantageous mutations lead to new phenotypes and over few generations leads to new speciation.
- This disturbance can cause new species to evolve in a population , more mutations in a population can be seen.
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