Which of these is called heterotypic division?A

Heterotypic division is another term for meiosis. It is specifically associated with the process of cell division that leads to the formation of gametes (sperm and eggs) in sexually reproducing organisms. Meiosis consists of two rounds of division: Meiosis I and Meiosis II.

Here's a breakdown of the options given in the question:

A. Meiosis I: This is the first stage of meiosis, where homologous chromosomes are separated. This division is heterotypic because it reduces the chromosome number from diploid (2n) to haploid (n).

B. Meiosis II: This is the second stage of meiosis, where sister chromatids are separated. Although it also plays a role in gamete formation, it is not referred to as heterotypic division, as it does not reduce the chromosome number.

C. Mitosis: This is a type of cell division that results in two genetically identical daughter cells, maintaining the same chromosome number. It is not considered a heterotypic division.

D. Amitosis: This is a simpler form of cell division that does not involve the formation of a spindle apparatus or the typical stages of mitosis or meiosis. It is not heterotypic division.

Based on this explanation, the correct answer is:

A. Meiosis I