Regarding fertilization which among the following statements is incorrect

Options

A. It restores diploid condition in the zygote
B. It activates egg both physiologically and metabolically
C. Paternal and maternal sets contribute to the diploid number without causing any variation.
D. It determines the sex of the offspring.

Answer

To determine which statement regarding fertilization is incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Statement 1**: "It restores diploid condition in the zygote."
- When a sperm (haploid) fertilizes an egg (haploid), they combine to form a zygote, which is diploid. This statement is true.

2. **Analyze Statement 2**: "It activates eggs both physiologically and metabolically."
- Fertilization triggers various physiological and metabolic changes in the egg, making it ready for development. This statement is also true.

3. **Analyze Statement 3**: "Paternal and maternal set contribute to the diploid number without causing any variation."
- In sexual reproduction, the combination of genetic material from both parents leads to genetic variation. Therefore, this statement is incorrect because fertilization does cause variation due to the mixing of genetic material.

4. **Analyze Statement 4**: "It determines the sex of the offspring."
- The sex of the offspring is determined by the combination of sex chromosomes contributed by the parents during fertilization. This statement is true.

### Conclusion:
The incorrect statement regarding fertilization is **Statement 3**: "Paternal and maternal set contribute to the diploid number without causing any variation."

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