Heredity

INHERITANCE

Each cell has two copies of each gene.

We have seen that chromosomes contain many genes. We think there are about 20000 human genes, carried on our two sets of 23 chromosomes.
Each cell in the body contains identical chromosomes, and therefore identical genes. But not all of these genes are switched on in every cell. Cells in different tissues use different collections of genes.

Esta entrada fue publicada en Senior 4- 2014. Guarda el enlace permanente.

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