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 can analyze each statement step by step.

### Step 1: Understand the Process of Fertilization
Fertilization is the process where a haploid male nucleus (from sperm) fuses with a haploid egg nucleus (from ovum) to form a diploid zygote. This process is also referred to as syngamy.

### Step 2: Analyze Each Statement
1. **Statement 1**: "It restores diploid condition in zygote."
- This statement is correct. The fusion of two haploid nuclei results in a diploid zygote.

2. **Statement 2**: "It activates egg both physiologically and metabolically."
- This statement is also correct. Fertilization activates the egg, making it metabolically active and initiating processes necessary for development.

3. **Statement 3**: "Paternal and maternal sets contribute to diploid number without causing any variations."
- This statement is incorrect. Sexual reproduction involves the recombination of genetic material, leading to variations. The recombination occurs during meiosis, specifically in the pachytene stage, which introduces genetic diversity.

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

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

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