Definitions (Cell Division)
CELL DIVISION
Cell: Cell is defined as the structural and the functional unit
of life.
Cell division; The process in which two or more daughter
cells of same kind are formed from pre-existing cells is called cell division.
Chromosome: The thread like structure in the nucleus of a
cells and carry hereditary information.
Genes: A tiny unit of heredity located in chromosome is called
genes.
Spindle fibre: A Thread like structure is formed at the
metaphase stage, in which chromosome are attached with centromere is called
spindle fibre.
Centromere: The two chromatids of chromosome are joined to
each other by a beaded like structure which is called centromere.
Interphase: The change that occur in newly formed cells till
they are ready for the further division.
Karyokinesis: The process of division of nucleus during cell
division.
Cytokinesis: The process of division of cytoplasm during
cell division.
Sex chromosome: Those chromosomes which occur singly or in a
pair and carry genes in determining the sex of the individual in unisexual
organisms.
Autosomes: Those chromosomes which regulates the growth
and development of the body of organism.
Chromatin fiber: The chromosome materials in the form of long
and very loosely coiled thread are called chromatin fiber.
Mitosis Cell Division: The type of cell division in which a
single diploid mother cell divides to form two diploid daughter cells is called
mitosis cell division.
Haploid cell: The cell which contains single chromosome for
each character is called haploid cell.
Diploid cell: The cell which contains two chromosomes for
each character is called diploid cell.
Meiosis cell division: A type of cell division in which a
diploid mother cell divides into four haploid daughter cells is called meiosis
cell division.
Amitosis or Direct cell division: The type of cell
division in which a cell divides into two daughter cells without the formation
of spindle fibre and condensation of chromatin fibre is called amitosis or
direct cell division.
Homologous chromosomes: The identical male and female parent
chromosomes occur in pair is called homologous chromosomes.
Synapsis: The phenomenon of pairing of homologous
chromosome is called synapsis.
Crossing over: The process of exchanging genetic material
between two non sister chromatid is called crossing over.
Chiasmata: The point on which crossing over takes place
is called chiasmata.
Leave a Comment