Human beings have 23 pairs of chromosomes in every cell, which makes 46 chromosomes in total.A photograph of a person's chromosomes, arranged according to size, is called a karyotype.DNA is also important because it is present in every single cell of our body; it helps in the growth and repair of all the body organisms.
Human beings have 23 pairs of chromosomes in every cell, which makes 46 chromosomes in total.A photograph of a person's chromosomes, arranged according to size, is called a karyotype.
If you took the DNA from all the cells in your body and lined it up, end to end, it would form a strand 6000 million miles long (but very, very thin)!
To store this important material, DNA molecules are tightly packed around proteins called histones to make structures called chromosomes.
Genes influence what we look like on the outside and how we work on the inside.
They contain the information our bodies need to make chemicals called proteins.
(Chromosome 22 should be the smallest, but the scientists made a mistake when they first numbered them! The DNA that contains your genes is stored in your cells in a structure called the nucleus.
A- DNA replication DNA replication is a biological process by which a molecule of DNA is copied.
But your genes also mean that you probably look a bit like other members of your family.
For example, have you been told that you have 'your mother's eyes' or 'your grandmother's nose'?
These bases link in a very specific way: A always pairs with T, and C always pairs with G. A gene is a length of DNA that codes for a specific protein. These genes account for only about 3 per cent of our DNA.
So, for example, one gene will code for the protein insulin, which is important role in helping your body to control the amount of sugar in your blood. The function of the remaining 97 per cent is still not clear, although scientists think it may have something to do with controlling the genes.