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Reference Notes on “Cell Division” – SLC Science

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Cell DivisionNotes | SLC
Reference Notes on “Cell Division”
For: Science Class 10

Cell division is a process of multiplication of cell by its division. It is of two major types. They are mitosis and meiosis.

1. Mitosis
Mitosis cell division is that in which one cell divides into two diploid daughter cells. It is also called educational cell division and mitotic cell division. It causes growth.

2. Meiosis
Meiosis cell division is that in which one cell divides into four haploid daughter cell. It is also called reductional cell division and meiotic cell division. It forms gamete.

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Some Technical Terms related to “Cell Division”:

Chiasmata are the points at which paired homologous chromosomes remain in contact during the prophase I of meiosis cell division.

Homologous chromosomes
Homologous chromosomes or bivalents are the pairs of identical chromosomes formed in the beginning of meiosis. One member of each pair comes from the female parent and other from the male.

Synapsis is the process of pairing chromosomes in the first phase of meiosis in order to make homologous pairs.

Crossing over
Crossing over is defined as an exchange of portions of chromatids between homologous chromosomes.

Chromatids are the thread like strands formed from a chromosome during the early stages of cell division. Each chromosome divides along its length into two chromatids, which are held together at the centromere and separate completely at a later stage.

Chromosomes are the thread like structures, which are found in the nucleus of plant and animal cells (eukaryotic cells). They are made of protein and nucleic acid.

Tetrads are the paired chromosomes in meiosis, after each chromosome has duplicated itself, and the pair is visibly four stranded.

Posted By : Hari Prasad Chaudhary | Comment RSS | Category : SLC Notes
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