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Byju's Answer
Standard XII
Biology
What Are Alleles
If two popula...
Question

If two populations of a species exist in isolation from each other, and one population experiences genetic drift while the other does not, what is the most likely outcome?

A
The two populations will experience allopatric speciation.
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B
The population that experiences genetic drift will go extinct.
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C
The two populations, because they are the same species, will stay in Hardy-Weinberg equilibrium with each other.
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D
Evolution will occur, since the gene frequencies in the gene pools of the two populations will change.
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Solution

The correct option is B The two populations will experience allopatric speciation.
The two species are in isolation from each other, that is there is no genetic exchange between the two species. In one of the populations genetic drift occurs, a sudden change in frequency of an allele may lead to formation of new species
So, the correct answer is 'The two populations will experience allopatric speciation'

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Q. Assertion :Genetic drift refers to change in allelic frequencies of a gene pool due to chance and occurs both in large and small populations. Reason: Small populations will, therefore, suffer more than larger ones.
Q.

Assertion : Hardy - Weinberg principle explains the variations occurring in population and species over a number of generations.

Reason : Hardy - Weinberg principle is applicable only when genetic drift occurs.
Q. Assertion: Hardy-Weinberg principle states that in the absence of disturbing influences, gene frequencies of large populations of sexually reproducing organisms do not change, provided that matings, occur at random.

Reason: The disturbing influences include mutation, gene flow, genetic drift, genetic recombination and natural selection.
Q. In a human population at Hardy-Weinberg equilibrium, the recessive gene is homozygous in 64% of the population. What will be the frequency of heterozygotes in the population?
Q. Two populations of a species of pine tree are located on opposite sides of a mountain range. The two populations are genetically similar to each other.
An invasive beetle infestation kills 80% of the trees on the west side of the range. The beetle population does not spread to the eastern side of the range, and the east tree population does not experience any beetle related loss. After the infestation, the western tree population increases in size again.
What is the expected outcome of genetic testing comparing the two populations?
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