NEET BIOLOGY

GENETICS AND EVOLUTION

EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Individuals moving in or out of a population won’t change the gene pool.
A
true
B
false
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -Gene pool frequencies do not change as a result of migrations in or out of a population. Gene flow occurs only as a result of migrations. Gene flow can cause new alleles to enter a population’s gene pool.

Detailed explanation-2: -Migration will change gene frequencies by bringing in more copies of an allele already in the population or by bringing in a new allele that has arisen by mutation. Because mutations do not occur in every population, migration will be required for that allele to spread throughout that species.

Detailed explanation-3: -Gene flow is the movement of genes into or out of a population. Such movement may be due to migration of individual organisms that reproduce in their new populations, or to the movement of gametes (e.g., as a consequence of pollen transfer among plants).

Detailed explanation-4: -Although gene flow does not change allele frequencies for a species as a whole, it can alter allele frequencies in local populations.

Detailed explanation-5: -The composition of a population’s gene pool can change over time through evolution. This can occur by a variety of mechanisms, including mutations, natural selection, and genetic drift. The result is a gene pool that is altered to be attuned to the needs of the population’s specific environment.

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