The germ cell A produced by a person X is round in shape and it fuses with another germ cell B having a long tail and produced by a person Y. The fusion of A and B produces a new cell C. The cell C divides repeatedly and grows inside the organ D of person X to form E in which the body features of the unborn baby are not much developed. E grows further to form F in which the various body features of the unborn baby (like hands, legs, eyes, and ears, etc.) can be identified. F grows further and ultimately forms a baby. What are A,B C,D E and F? Out of the two person X and Y, which one is male and which one female?

Answer

**Step-by-Step Solution:**

1. **Identify Germ Cells A and B:**
- Germ cell A is described as round in shape, which indicates it is a female gamete (ovum or egg).
- Germ cell B has a long tail, indicating it is a male gamete (sperm).

**Conclusion:**
- A = Ovum (female gamete)
- B = Sperm (male gamete)

2. **Determine the Gender of Persons X and Y:**
- Since A (the ovum) is produced by person X, person X must be female.
- Since B (the sperm) is produced by person Y, person Y must be male.

**Conclusion:**
- X = Female
- Y = Male

3. **Fusion of A and B:**
- The fusion of the ovum (A) and sperm (B) produces a new cell C, known as a zygote.

**Conclusion:**
- C = Zygote

4. **Growth of Cell C:**
- The zygote (C) divides repeatedly and grows inside the organ D of person X, which is the uterus.

**Conclusion:**
- D = Uterus

5. **Development of E:**
- The zygote develops into an embryo, which is the early stage of development before the features of the unborn baby are fully formed.

**Conclusion:**
- E = Embryo

6. **Development of F:**
- As the embryo (E) grows further, it develops into a fetus (F), where various body features of the unborn baby (like hands, legs, eyes, and ears) can be identified.

**Conclusion:**
- F = Fetus

7. **Final Summary:**
- A = Ovum (female gamete)
- B = Sperm (male gamete)
- C = Zygote
- D = Uterus
- E = Embryo
- F = Fetus
- Person X is Female and Person Y is Male.

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