Courses for Kids
Free study material
Offline Centres
Store Icon

Meiosis during sperm formation of Ascaris, was first observed by
(a) Fleming
(b) Boveri
(c) Brauer
(d) De Vries
(e) Abbe

Last updated date: 13th Jun 2024
Total views: 392.4k
Views today: 3.92k
392.4k+ views
Hint: Sperm formation is also known as spermatogenesis in which sperms are made from spermatogonia which are present in the lining of the walls of the testis. Ascaris is a genus that belongs to roundworms and some of its species cause diseases in humans as well.

Complete Answer:
The process of spermatogenesis is as follows:
- Male germs cells or the spermatogonia cells divide in number by mitosis to form primary spermatocytes.
seo images

- These primary spermatocytes are made into secondary spermatocytes by meiosis-I which in turn undergo meiosis-II to form spermatids.
- Spermatids undergo further development to form the spermatozoa or sperms.
- This process was first observed by Brauer in Ascaris.

Additional information: Let us look at the other scientists mentioned in the options.
- Alexander Fleming was a Scottish physician who discovered penicillin, the first antibiotic from Penicillium notatum.
- Theodor Boveri proposed the chromosomal theory of inheritance along with Sutton. He also discovered centrioles of centrosomes in Ascaris.
- Hugo de Vries was a Dutch botanist who worked on the inheritance pattern in evening primrose and proposed that mutations are responsible for variation in a population.
- Lemaitre Abbe was a priest who proposed the theory of the expanding universe.
So, the correct option is ‘(c) Brauer’.

- Aschelminthes are known as roundworms because they appear round when a cross- section of their body is viewed.
- Aschelminthes are triploblastic, pseudocoelomate, and bilaterally symmetrical animals.
- Ascaris lumbricoides cause ascariasis in humans which is an infection of the intestines.
- Another roundworm which is known as the filarial worm (Wuchereria) causes elephantiasis in humans by affecting the lymphatic vessels of the lower limbs.