EVOLUTION
SOURCES OF VARIATION IN A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A spontaneous change in a chromosome due to mutagens
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A spontaneous change in a chromosome due to recombination
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A permanent change in a chromosome after fertilisation
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A permanent change in a chromosome due to crossing over
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Detailed explanation-1: -Mutations are the random changes in genetic material of organisms leading to genetic diversity.
Detailed explanation-2: -Spontaneous mutation, also known as background mutation, can be defined as genetic changes that occur in the absence of mutagens and have no known cause. It may result from activities of a normal cell, such as mistakes or errors during DNA replication.
Detailed explanation-3: -Mutagenesis is the process by which an organism’s deoxyribonucleic acids (DNA) change, resulting in a gene mutation. A mutation is a permanent and heritable change in genetic material, which can result in altered protein function and phenotypic changes.
Detailed explanation-4: -Deletion and insertion of base pairs cause frameshift mutations.