CBSE Class 8 Answered
2)i know that eyery normal human cell has 23 pairs of chromosoes.so lie the cells presnt in the skin will have the same type ofchromosomes as the cell presennt in any other organ of the body such as mammary gland etc... or do the chromosems show varitons?
Asked by yogeshmittal177 | 16 Oct, 2015, 12:34: PM
Expert Answer
- Any cell in the human body which is not a gamete, i.e., either a sperm or an ovum/egg cell is called a somatic cell. The reproductive cells of the body are called the germ cells.
- Skin cells, nerve cells, cells of the mammary gland and muscle cells are all somatic cells. Sperm and ovum are germ cells.
- Somatic cells always have twice the number of chromosomes found in the germ cells/gametes.
- Somatic cells contains 23 pairs of chromosomes (22 autosomes + 1 sex chromosome (X/Y)
- Germ cells contain only 23 chromosomes (22 autosomes + 1 sex chromosome (X/Y)
- The chromosomal set of 23 chromosomes present in different parts of the body do not show variations. However, the individual chromosomes such as chromosomes 1, 2, 3, X, Y etc. show variations with respect to size, length and the number of genes.
Answered by Sheetal Kolte | 16 Oct, 2015, 05:08: PM
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