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Gene Flow

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Question

Place the following in correct sequence
Natural selection/Migration/New species/Gene flow

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Solution

Migration
Gene flow
Natural selection
New species.

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Q. Fill up the blanks in the following paragraph by selecting the correct option.
When migration of a section of population to another place and population occurs, __(i)__ change in the original as well as in the new population. New genes/ alleles are added to the __(ii)__ population and these are lost from the __(iii)__ population. There would be a __(iv)__ if this gene migration, happens multiple times. If the same occurs by chance, it is called __(v)__, Sometimes the change in allele frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders and the effect is called __(vi)__.

Q. In the absence of mutation, migration and selection, if gene frequencies are changed in a population, the change is due to

Q. Given: 1= Natural selection; 2= Variations and their inheritance; 3= Survival of the fittest; 4= Struggle for existence.
According to Darwinism, which of the following represents the correct sequence of events in the origin of new species?

What do you call the movement of a gene (gene flow) from one species into the gene pool of another by the repeated backcrossing?

Q. Read the following statements and select the correct option.

I. When certain individuals migrate out of the population, gene frequencies change in the population.

II. Stabilising, directional and disruptive selection are types of artificial selection.

III. Extreme phenotypes are favoured in the disruptive selection.

IV. Single step large mutation is called genetic drift.

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