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Question

Assertion (A): Sex in all the living organisms is not genetically determined.

Reason (R): In snails, individuals can change sex, indicating that sex is not genetically determined.
  1. Only A is correct.
  2. Only R is correct.
  3. Both A and R are correct but R is not the correct explanation for A.
  4. Both A and R are correct and R is the correct explanation for A.


Solution

The correct option is D Both A and R are correct and R is the correct explanation for A.
The process of sex determination in snails is not genetically determined. This means that the sex of the child is not determined by the genes inherited from the parents. In organisms like snails, individuals can change sex. E.g., Crepidula (slipper snails), here the larva develops into male if it is present in association with the female, while if alone it forms female.

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