NEET BIOLOGY

GENETICS AND EVOLUTION

EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
As a result of rising ocean levels, an island that once contained a homogenized population of arabidopsis has now undergone genetic drift. The island has been divided into two parts, separated by a significantly large body of water. What is likely to have happened to result in two genetically different populations that can no longer reproduce?
A
Artificial selection
B
Synetny
C
Allopatric speciation
D
Sex linked genes
E
Adaptive radiation
Explanation: 

Detailed explanation-1: -The length of time required for the divergence of reproduction in newly formed species is long. Speciation occurs only after the reproductive divergence. Therefore, speciation begins rapidly between diverging populations, but the formation of new species takes more than a million years.

Detailed explanation-2: -AI Recommended Answer: B. A single plant in a population of sunflowers produces diploid gametes that have two sets of chromosomes instead of the normal one set of chromosomes.

Detailed explanation-3: -Allopatric speciation (1) occurs when a species separates into two separate groups which are isolated from one another. A physical barrier, such as a mountain range or a waterway, makes it impossible for them to breed with one another.

Detailed explanation-4: -Allopatric speciation is more common than sympatric speciation because the geographic isolation that’s present in allopatric speciation prevents the flow of genes between separate populations of a species, allowing genetic drift to have a greater effect on the separate groups.

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