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When does the process of sex determination occur in humans?

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Before fertilization

After fertilization

During the process of fertilization

At the time of the formation of the ovum

answer is B.

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Detailed Solution

In humans, sex determination is the process of determining the sex of an organism, which is determined by the combination of sex chromosomes received by the fertilized egg from the sperm and the egg.

This process begins after fertilization, specifically during the fusion of the sperm and egg.

The sperm can carry either an X or a Y chromosome, while the egg always carries an X chromosome.

If a sperm carrying an X chromosome fertilizes the egg, the resulting zygote will have XX chromosomes and develop as a female.

If a sperm carrying a Y chromosome fertilizes the egg, the resulting zygote will have XY chromosomes and develop as a male.

Therefore, sex determination in humans occurs during fertilization, before the fertilized egg implants in the uterus and develops into a fetus.

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