Question

Dyad is a pair of
A) Sister chromatid
B) Non sister chromatids
C) Homologous chromosomes
D) Non homologous chromosomes

Answer 1

Hint:- The mitosis involves four phases- Prophase, metaphase, anaphase, and telophase. Mitosis is the type of cell division in which the number of chromosomes remains the same as in the parent cell. Mitosis is also known as somatic division And the progeny cell resembles the parent cell in all aspects.

Complete Answer:-
In prophase, the chromatin material condenses. The nucleolus and the nuclear membrane disappear. The chromosomes are already divided into sister chromatids. The sister chromatids are joined at the center by the centromere. These forms are dyad. Metaphase is the please in which the chromosomes arrange themselves at the equator. All the chromosomes are paired up as sister chromatids connected at the centromere. Thus the dyad is a pair of sister chromatids. These sister chromatids are attached to the Spindle fibers. The spindle fibers are formed by the centrioles which place themselves at the poles and the end of metaphase. In anaphase, the dyad is broken by tearing apart the centromere to separate the sister chromatids. In telophase these spindle fibers contract to pull apart sister chromatids towards the opposite poles thus completing the process of nuclear division.
Thus, the right option is A.

Note:- The process of nuclear division is followed by cytokinesis which involves the division of the cytoplasm of the parent cell into the progeny cells. The formation of the dyad is also seen in the meiosis type of cell division in Prophase 1. The dyad of meiosis is broken in anaphase II of meiosis II.