The diploid number of chromosomes a. is the 2n number. b. is...

The diploid number of chromosomes

a. is the 2n number.
b. is in a parent cell and therefore in the two daughter cells following mitosis.
c. varies according to the particular organism.
d. is present in most somatic cells.
e. All of these are correct.

Key Concepts

Diploid Number

This is the total number of chromosomes present in the typical, non-reproductive (somatic) cells of an organism, usually represented by the notation 2n. It indicates that each chromosome is present in two copies, one inherited from each parent.

Mitosis

This is the cell division process that produces two genetically identical daughter cells from a single parent cell, ensuring that the diploid number of chromosomes is maintained in the somatic cells throughout an organism’s life.

Species-Specific Chromosome Numbers

The diploid number of chromosomes varies between different organisms and is a defining genetic characteristic of each species.

Somatic Cells

These are any cells in the body that are not involved in reproduction. They typically contain a diploid set of chromosomes, which is essential for the proper functioning and development of an organism.

Transcript

00:01 This question deals with the concept of ploidy.

00:10 And that is basically the number of chromosomes that you have in a cell.

00:17 So humans are deployed.

00:25 And deployed means two.

00:29 So that means we have two sets of chromosomes in our cells.

00:32 So if you consider a cell.

00:35 And i am going to draw just one chromosome here for simplicity.

00:40 But in our cells, so in our somatic body cells, we have two sets of chromosomes.

00:47 So suppose this is our chromosome one, we would have a maternal chromosome one.

00:55 And we have a pair, and we have 23 pairs altogether, right? so we have two chromosome ones, two chromosome twos, and so on.

01:05 And for our somatic cells, let me stay consistent with the colors here, for our somatic cells, when they undergo mitosis or division, when a somatic cell divides, the two daughter cells will have exactly the same identical makeup as the mother cell.

01:29 So the two daughter cells will also have a gene or a chromosome from the mother and a chromosome from a father.

01:39 This is not the case for sex cells or gametes.

01:43 Gametes, you make haploid cells because then you need to form a zygote with one chromosome from mom and one chromosome from dad to make a diploid zygote.

01:55 But for somatic cells, this is how it goes.

02:00 Okay, so that is the overall overview of ploidy.

02:04 Somatic cells, so let me switch back to black here.

02:13 Batic cells are diploid, and that is basically what 2n means.

02:26 You have 2n chromosomes.

02:29 Gametes are haploid, and they have 1n.

02:39 So basically, suppose that this was a sex cell that was dividing to form four different gametes.

02:48 Each one of the four gametes, so one, two, three, four would have only one set of chromosomes in it...