Two different types of gametes in terms of the sex chromosomes, are produced by

Options

A. Female fruit fly
B. Male butterfly
C. Male human and female Drosophila
D. Female birds

Answer

To answer the question regarding which organisms produce two different types of gametes in terms of sex chromosomes, we will analyze the gamete production in various organisms mentioned in the question.

### Step-by-Step Solution:

1. **Understanding Gamete Formation**:
- Gametes are reproductive cells that carry half the genetic information of an organism. In terms of sex chromosomes, organisms can be classified as either homogametic (producing one type of gamete) or heterogametic (producing two types of gametes).

2. **Analyzing the Female Fruit Fly (Drosophila melanogaster)**:
- The female Drosophila has a diploid number (2n) of 8, which includes 3 pairs of autosomes and 1 pair of sex chromosomes (XX).
- Since both sex chromosomes are X, the female Drosophila produces only one type of gamete: X (with autosomes).
- Conclusion: The female Drosophila does not produce two different types of gametes.

3. **Analyzing the Male Butterfly**:
- In butterflies, the sex determination system is known as the XX/X0 system.
- The male butterfly is heterogametic, producing two types of gametes: one with an X chromosome and one without (0).
- Conclusion: The male butterfly produces two different types of gametes.

4. **Analyzing Human Males**:
- Human males have a diploid number of 46 chromosomes, with one pair being XY.
- Human males produce two types of gametes: one with an X chromosome and one with a Y chromosome.
- Conclusion: Human males also produce two different types of gametes.

5. **Analyzing Female Birds**:
- In birds, the sex determination system is ZW/ZZ.
- Female birds are heterogametic, producing two types of gametes: one with a Z chromosome and one with a W chromosome.
- Conclusion: Female birds produce two different types of gametes.

6. **Final Conclusion**:
- The organisms that produce two different types of gametes in terms of sex chromosomes are the male butterfly, human males, and female birds. Therefore, the correct answers are the male butterfly and female birds.

### Summary of Correct Answers:
- **Male Butterfly** (produces X and 0 gametes)
- **Human Male** (produces X and Y gametes)
- **Female Birds** (produces Z and W gametes)