Which of the following male animals is NOT heterogametic?

Options

A. `{:("animal", "chromosome complement"), ("fruit fly", 2n=6 + XY):}`
B. `{:("animal", "chromosome complement"), ("fowl", 2n = 12 + XX):}
C. `{:("animal", "chromosome complement"), ("grasshopper", 2n = 16 + XO):}
D. `{:("animal", "chromosome complement"), ("human", 2n = 44 + XY):}`

Answer

To determine which male animal is NOT heterogametic, we first need to understand the concept of heterogametic and homogametic sexes.

### Step-by-Step Solution:

1. **Define Heterogametic and Homogametic**:
- Heterogametic males produce two different types of gametes (sperm), typically one with an X chromosome and one with a Y chromosome (e.g., XY).
- Homogametic males produce only one type of gamete, which means they have two of the same sex chromosomes (e.g., XX).

2. **Identify the Male Animals in the Question**:
- The question mentions various male animals, but we need to focus on their chromosomal complement to determine their sex determination system.

3. **Analyze the Chromosomal Complement**:
- In species like humans, fruit flies (Drosophila), and many other organisms, males are typically XY (heterogametic).
- However, in some species, males can be XX (homogametic).

4. **Look for Examples**:
- For example, in birds, the male is typically ZZ (homogametic), while females are ZW (heterogametic).
- In some reptiles and amphibians, males can also be homogametic.

5. **Conclusion**:
- Based on the information provided, if we are considering common examples, a male animal that is NOT heterogametic would be one that has a homogametic sex chromosome configuration, such as ZZ in birds.

### Final Answer:
The male animal that is NOT heterogametic is the one with a homogametic configuration, such as the male bird (ZZ).