00:01
Chromosomes chromosomes play a crucial role with regard to the genetic material separation either during the process of mitosis or during the meiosis and this chromosome exists in the form of sets that is if only one copy of a particular chromosome is found it is said to be haploid and this haploid nature of the chromosome is denoted with the letter n whereas when two when two copies in turn form a particular set, this in turn it is referred to be as diploid and diploid in turn is denoted by the letter 2n.
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So haploid chromosomes are seen in the germ cells whereas the diploid chromosome number it is seen in the somatic cells.
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This is the feature of a particular chromosome set and when there are certain conditions when the chromosome number can change.
01:00
And these conditions can be denoted in two forms.
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The first one, it is called as the anuploidy.
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And the second one, it is called as the polyploidy.
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Anuploidy is the one in either which there will be either addition or deletion of just a chromosome.
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Let's light chr for chromosome.
01:23
With regard to polyploidy, there will be addition or deletion of complete chromosome set.
01:29
So here chromosome set in turn can denote two chromosomes, that is the deployed nature of a particular chromosome.
01:38
So with regard to this one such condition with regard to uneploidy, it is called as the down syndrome...