The instructions for inherited characteristics are found in genes which are inside the nuclei of cells., During sexual reproduction, two gametes (one male and one female) fuse during fertilisation to produce a zygote., A zygote contains half the genetic information from each parent., All gametes are different so they always contain slightly different genetic material. , If someone has a cleft chin, it does not mean that all their gametes will contain the gene for a cleft chin. , The features of an organism are called its characteristics. , Examples of continuous variation are height, body weight and skin colour. , Examples of discontinuous variation are blood group, cleft chin and shoe size. , A species is the smallest group into which scientists classify organisms. , Members of the same species can reproduce with each other to produce fertile offspring. ,

Year 9 Classification and Inheritance

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