Which of these is called heterotypic division?
A. Meiosis I
B. Meiosis II
C. Mitosis
D. Amitosis

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Detailed Solution

Heterotypic division refers to the first meiotic division (Meiosis I), where the number of chromosomes is halved. It is called “heterotypic” because it produces daughter cells with half the number of chromosomes compared to the parent cell.

Meiosis I: Homologous chromosomes pair, undergo crossing over, and then separate into two cells. Each resulting cell has haploid (n) chromosomes, though each chromosome still has two chromatids. This reductional step makes it heterotypic.
Meiosis II: Equational division, similar to mitosis, where sister chromatids separate.
Mitosis: Equational division, chromosome number remains same.
Amitosis: Direct simple division, no chromosome pairing.

Therefore, the correct answer is Meiosis I (Option A).

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