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Question:

Which of the following statement is true for variation in organisms?

(P) and (S)

(Q) and (S)

(P) and (R)

(Q) and (P)

Solution:

During gamete formation, in meiosis, crossing over takes place and genes are exchanged which results in variations in organisms. Variations are the reasons why individuals of the same species differ from each other. It also increases the possibility of survival as more adventitious variations accumulate in the species and help in the process of evolution. Thus, the correct answer is option A.