Haan like animals have pen for reprodctn same male Ascaris have pen like structure called penial setae .setae ka mtlb hair like outgrowth for attachment

Sexual Dimorphism in Ascaris

Sexual dimorphism refers to the differences in size, shape, and other physical characteristics between males and females of the same species. Ascaris is a genus of parasitic roundworms, and it exhibits sexual dimorphism as well. The distinct sexual dimorphism in Ascaris is primarily attributed to the presence of penial setae in males.

Penial Setae

Penial setae are specialized structures found in the male reproductive system of Ascaris. These structures are located in the posterior region of the male worm, specifically in the cloaca. The cloaca is a common chamber that serves as the opening for the male reproductive system, excretory system, and digestive system. Penial setae are hair-like projections that aid in mating and copulation.

The presence of penial setae is a characteristic feature of male Ascaris worms. These structures play a crucial role in sexual reproduction. During copulation, the male worm uses its penial setae to grasp and hold onto the female worm. This ensures a secure mating position and facilitates the transfer of sperm from the male to the female.

Importance of Penial Setae in Sexual Dimorphism

The presence of penial setae in male Ascaris worms is a key factor contributing to the sexual dimorphism observed in this species. Female Ascaris worms lack these specialized structures, which sets them apart from males. The absence of penial setae in females is one of the distinguishing characteristics that can be used to differentiate between males and females.

The distinct sexual dimorphism in Ascaris, primarily due to the presence of penial setae in males, allows for efficient mating and reproduction. This sexual dimorphism ensures successful fertilization and the continuation of the species.

In conclusion, sexual dimorphism in Ascaris is distinct due to the presence of penial setae in males. These specialized structures play a crucial role in mating and copulation, allowing for successful reproduction. The absence of penial setae in females is a distinguishing characteristic that sets them apart from males.