You and Your Genes Revision Lesson 1. What are Genes?. All living organisms are made of cells Most cells have a nucleus In the nucleus are chromosomes, made from DNA. To write: DNA makes up chromosomes in the nucleus of cells. Chromosomes contain thousands of genes
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DNA makes up chromosomes in the nucleus of cells.
Sections of chromosomes are called genes, which control cells and code for proteins.
Most human cells have 46 chromosomes (23 pairs – one from each parent).
Different versions of genes are called alleles.
Our mix of alleles determines what we are like.
Most characteristics are due to a number of genes. Some are due to only one gene, and some are affected by environment.