What will you look for to identify the sex of the following

Options

A. Male Frog-a copulatory pad on the first digit of the hind limb
B. Female cockroach - anal cerci
C. Male Shark - Claspers born on pelvic fins
D. Female Ascaris - Sharply curved posterior end

Answer

To identify the sex of the specified animals, we can follow these steps:

1. **Male Frog**:
- Look for the presence of **nuptial pads**. These are thickened, darkened areas found on the first digit of the hind limbs of male frogs. They are used during mating to help grasp the female.

2. **Female Cockroach**:
- Check for the presence of **anal cerci**. In female cockroaches, the anal cerci are more prominent and are typically broader and shorter compared to males, which have a structure called the **anal style** that is longer and thinner.

3. **Male Shark**:
- Look for **claspers** on the pelvic fins. Male sharks possess these elongated structures which are used to transfer sperm to the female during mating.

4. **Female Ascaris**:
- Identify the **posterior end** of the organism. The female Ascaris has a sharply curved or pointed posterior end, which is distinct from the male that has a more straight or blunt end.

### Summary:
- **Male Frog**: Nuptial pads on hind limbs.
- **Female Cockroach**: Anal cerci.
- **Male Shark**: Claspers on pelvic fins.
- **Female Ascaris**: Sharply curved posterior end.