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[A] : Meiosis maintains a constant numbe...

[A] : Meiosis maintains a constant number of chromosomes .
[R] : Synapsis and crossing over introduce changes in the DNA .

A

If both A and R are true and R is the correct explanation of A

B

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

C

If A is true and R is false

D

If both A and R are false

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