Non-genetic sex determination is found in :

Options

A. Fruitfly
B. Bonellia
C. Cow
D. Birds

Answer

**Step-by-Step Solution:**

1. **Understanding Non-Genetic Sex Determination**: Non-genetic sex determination refers to a mechanism where the sex of an organism is determined by environmental factors rather than genetic factors (chromosomes).

2. **Identifying Examples**: The question asks for examples of organisms that exhibit non-genetic sex determination. The transcript mentions Bonavia (a type of worm), cows, and birds.

3. **Analyzing Each Example**:
- **Cows**: Cows are mammals that exhibit genetic sex determination. Their sex is determined by the presence of XX (female) or XY (male) chromosomes. Therefore, they do not fall under non-genetic sex determination.
- **Birds**: In birds, sex is also determined genetically by the presence of ZZ (male) or ZW (female) chromosomes. Thus, birds also do not exhibit non-genetic sex determination.
- **Bonavia**: This is a type of worm that exhibits non-genetic sex determination. The sex of Bonavia is determined by environmental factors, specifically whether they are attached to their female mother (male) or not (female).

4. **Conclusion**: Based on the analysis, the correct answer to the question is Bonavia, as it is the only example provided that demonstrates non-genetic sex determination.

5. **Final Answer**: Non-genetic sex determination is found in Bonavia (a type of worm).

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