Which of the following organisms do not show male heterogamety ?

Options

A. hens
B. humans
C. fruit flies
D. grasshoppers

Answer

To solve the question "Which of the following organisms do not show male heterogamety?" we need to analyze the sex determination mechanisms in each of the given organisms: hens, humans, fruit flies, and grasshoppers.

### Step-by-Step Solution:

1. **Understand Male Heterogamety**: Male heterogamety refers to the condition where males produce two different types of gametes. This is typically represented by different sex chromosomes (e.g., XY in humans or X0 in fruit flies).

2. **Analyze Each Organism**:
- **Hens (Birds)**: In birds, males have the genotype ZZ (homogametic) and females have the genotype ZW (heterogametic). Therefore, males do not show male heterogamety.
- **Humans**: In humans, males have the genotype XY (heterogametic) and females have the genotype XX (homogametic). Thus, males do show male heterogamety.
- **Fruit Flies**: In fruit flies, males have the genotype X0 (heterogametic) and females have the genotype XX (homogametic). Hence, males do show male heterogamety.
- **Grasshoppers**: In grasshoppers, males also have the genotype X0 (heterogametic) and females have the genotype XX (homogametic). Therefore, males show male heterogamety here as well.

3. **Conclusion**: After analyzing the sex determination in each organism, we find that only hens (ZZ) do not show male heterogamety, as they produce only one type of gamete (Z).

### Final Answer:
The organism that does not show male heterogamety is **Hens**.

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