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Assertion (A) Red, green colour blindness occurs with more frequency in males than in females. Reason (R) Females have two X-chromosomes and males have one.

if both A and R are true and R is the correct explanation of A
if both A and R are true and R is not the correct explanation of A
if A is true but R is false
if A is true but R is true

Correct Answer: if both A and R are true and R is the correct explanation of A

Explanation:

Both assertion and reason are correct and reason is correct explanation for the assertion as if mutation for colour blindness occurs in one X-chromosome, female have one normal chromosome.

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