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In human zygote male sex is determined b...

In human zygote male sex is determined by

A

Strength of father

B

Nutrition of mother

C

Compostion of required chromosomic

D

None of the above

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Sex Determination in Humans:** - In humans, sex is determined by the combination of sex chromosomes contributed by the parents. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). 2. **Gamete Formation:** - During gamete formation in males, two types of sperm can be produced: one carrying an X chromosome and the other carrying a Y chromosome. This means that the male can contribute either an X or a Y chromosome to the zygote. 3. **Fertilization Process:** - When fertilization occurs, the sperm (carrying either X or Y) combines with the ovum (which always carries an X chromosome). - If the sperm carrying an X chromosome fertilizes the ovum, the resulting zygote will be XX (female). - If the sperm carrying a Y chromosome fertilizes the ovum, the resulting zygote will be XY (male). 4. **Conclusion on Male Sex Determination:** - Therefore, the sex of the human zygote is determined by the type of sperm (X or Y) that fertilizes the egg. This means that the male sex is determined by the presence of the Y chromosome. 5. **Evaluating the Options:** - The options provided were: - Strength of father - Nutrition of mother - Composition of required chromosomic content - None of the above - The correct answer is "composition of required chromosomic content" as it refers specifically to the sex chromosomes (X and Y) that determine the sex of the zygote. **Final Answer:** In a human zygote, male sex is determined by the composition of required chromosomic content (specifically the presence of the Y chromosome). ---
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