Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Supernumerary chromosomes do not usually have any effect on the phenotype and hence, are genetically un-necessary. Reason: In some plants supernumerary chromosomes result in decreased vigour.A) If both assertion and reason are true and reason is the correct explanation of assertion
B) If both assertion and reason are true but reason is not the correct explanation of assertion
C) If assertion is true but reason is false
D) If both assertion and reason are false.
Correct Answer: B
Solution :
Any chromosome that is additional to the- regular karyotype of a species is called supermerary chromosome. Such chromosome may or may not affect the phenotype. In humans about one person in every 1500 carrier an accessory chromosome or B-chromosome.
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