Inside the nucleus are chromosomes
Chromosome = 1000s of coils of genes
Genes = comprise ‘DNA’ that decides our characteristics
DNA = deoxyribonucleicacid (chemical)
Each gene acts as a code for a particular characteristic
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A human egg cell and sperm cell contains 23 chromosomes
Embryo therefore contains 23 pairs of chromosomes
Each pair contains a gene from your mother, and a gene from your father for a particular characteristic
So each pair contains two “options” for a characteristic
These options are called alleles e.g. gene = eye colour; alleles = blue eye colour, brown eye colour
DNA and the Human Genome Project
This Video gives you a brief introduction to DNA with a graphic of the double helix stricture.
This video explains how to sequence the Human Genome which is a result of the work done on the Human Genome Project.
