Question

What will you look for to identify the sex of the following?
A. Male shark-claspers borne on pelvic fins
B. Female ascaris- sharply curved posterior end
C. Male frog – a copulatory pad on the first digit of the hindlimb
D. Female cockroach – anal cerci

Answer 1

Let us first look into how the gender of an organism is seen. The cells from females contain two X chromosomes, while the cells from males contain an X and a Y chromosome. Sometimes individuals are born with sex chromosome aneuploidies, and the sex of these individuals is always determined by the absence or presence of a Y chromosome.

Complete answer:

The male sharks have also a paired intromittent organs, called claspers. Claspers are modifications of the pelvic fins and located on the inner margins of the pelvic fins.
The male Ascaris possess the curled posterior end, while females have a straight posterior end.
The male frogs can be distinguished by the presence of the sound producing vocal sacs and also a copulatory pad on the first digit of the forelimbs (not hind limbs), which are absent in female frogs.
The Anal cerci are a pair of appendages at the end of the abdomen, arising from near the 10th segment of the body, present in both males and females. The males possess anal style, which is not present in the females.

The correct answer is option A.

Note: The female sharks are the one who is first in the emission of the chemicals. The chemicals signal to males in the surrounding area that the female is ready to mate.
The chemicals that are found are called pheromones and are common in other animals as well.
Also adding to the discomfort of a 2-year gestation in some cases a few deep sea sharks are also able to get pregnant as soon they give birth.
They accomplish this by cycling through a conveyor belt of babies, with fully formed pups at the bottom of the uterus and large eggs waiting to be fertilized at the top.