Write true or false for the following statements:

A child who inherits a Y-chromosome from father will be a girl.

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In snails, individuals can change sex, indicating that sex is not genetically determined in them.

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A child who inherits an X-chromosome form father will be a boy.

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There is an inbuilt tendency to variation during reproduction, both because of errors in DNA copying and as a result of sexual reproduction.

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The frequency of certain genes in a population changed one generation. This is the essence of the idea of evolution.