Pick the correct combination of sperm cell and egg cell that can lead to the formation of a male offspring.

Options

A. sperm cell having X chromosome + egg cell having Y chromosome
B. sperm cell having X chromosome + egg cell having X chromosome
C. sperm cell having Y chromosome + egg cell having X chromosome
D. sperm cell having Y chromosome + egg cell having Y chromosome

Answer

To determine the correct combination of sperm cell and egg cell that can lead to the formation of a male offspring, we need to understand the chromosomal contributions of both the sperm and the egg.

### Step-by-Step Solution:

1. **Understanding Chromosomes**:
- In humans, females have two X chromosomes (XX), making them homozygous for the sex chromosomes.
- Males have one X and one Y chromosome (XY), making them heterozygous for the sex chromosomes.

2. **Gamete Formation**:
- During gamete formation, females produce eggs that carry only X chromosomes.
- Males produce sperm that can carry either an X or a Y chromosome.

3. **Combination Analysis**:
- To produce a male offspring, the combination of chromosomes must result in XY.
- The possible combinations from the options given are:
- Sperm (X) + Egg (Y) → Not possible (eggs only have X)
- Sperm (X) + Egg (X) → Results in female (XX)
- Sperm (Y) + Egg (X) → Results in male (XY)
- Sperm (Y) + Egg (Y) → Not possible (eggs only have X)

4. **Conclusion**:
- The only combination that can lead to the formation of a male offspring is when the sperm cell carries the Y chromosome and the egg cell carries the X chromosome. Therefore, the correct answer is:
- Sperm (Y) + Egg (X) → Male (XY)

### Final Answer:
The correct combination of sperm cell and egg cell that can lead to the formation of a male offspring is: **Sperm (Y) and Egg (X)**.

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