Question

Amitosis was coined by
A. Farmer
B. Remac
C. Strassburger
D. Fleming

Answer 1

Hint: Amitosis is a division of the cells by simple nucleus cleavage and cytoplasm division without spindle formation or chromosome presence.

Complete Answer:
The mechanism in which a parent cell divides, giving rise to two or more daughter cells, is cell division. In many species, it is an important biological mechanism. It is the means used for development, replenishment (repair), and reproduction by multicellular organisms. In single-cellular species, reproduction is analogous to cell division. Two ways of cell division exist: (1) Direct division of cells and (2) Indirect division of cells.

Direct cell division is one in which the cell actually divides, as in indirect cell division (such as mitosis), and does not undergo complex changes until it divides. Without the previous creation of chromosomes, the nucleus and cytoplasm of the cell differentiate by constriction. This type of direct division of cells is also called amitosis.

Flemming coined it. It is a cell proliferation mechanism that does not occur by mitosis. It is an asexual reproduction process. Karyokinesis and cytokinesis are performed in two steps. The nucleus first elongates and, with a narrow constriction, takes a dumbbell form that gets deeper later and splits the nucleus into two halves. Cytokinesis occurs by cytoplasm constriction that divides the cell into two equivalent or roughly identical halves.

Amitosis occurs in paramecium mega-nucleus, Cham internodal cell nuclei, seed endosperm cells, cartilage cells and diseased cells. Remak (1955) discovered chick embryo amitosis in RBCs, but Flemming (1882) coined the term.

The correct Answer i option (D) Fleming.

Note: Amitosis is distinguished by:
I. Via nut division, the intact nuclear envelope is located.
II. Chromatin does not condense into chromosomes that are definite.
III. They do not form a spindle.
IV. Chromatin distribution occurs unequally, causing metabolism and reproduction defects.
V. Cytokinesis may obey karyokinesis, or may not.