The product after the union of the male and female gamete in animals is called

1. Analyze the question The question asks for the name of the product formed when a male gamete fuses with a female gamete. This process is called fertilization.

2. Explain the concept

• Gametes are sex cells. They are haploid (n), meaning each carries half the normal number of chromosomes. • Male gamete: sperm • Female gamete: egg (ovum)
• When the sperm fuses with the egg during fertilization, the result is a single diploid (2n) cell called a zygote.
• The zygote then divides repeatedly by mitosis. After several divisions it develops into an embryo.

3. Step-by-step solution

• Sperm (n) + Egg (n) → fertilization → Zygote (2n)
• Zygote → mitosis (cell divisions) → Embryo → Foetus → Baby

Now check each option:

• A. Sperm: this is the male gamete itself, not the product of the union.
• B. Egg: this is the female gamete itself, not the product.
• C. Embryo: this develops later from the zygote after cell division. It is not the immediate product of fusion.
• D. Zygote: this is the fertilized egg, formed directly when the two gametes fuse.

4. Answer The correct option is D. zygote.

5. Exam tip Remember the order G-Z-E-F: Gametes → Zygote → Embryo → Foetus. The zygote always comes first after fertilization. If a question says "the immediate product of fusion", the answer is always zygote.