Key Facts

• Most of your features are effected by your environment and your genes.

• Genes are found in the nuclei of cells and are the instructions for making proteins.

• Your chromosomes, and genes are in pairs.

• Genes have different versions - that are called alleles.

• Men and women have different sex chromosomes.

• We all have some features in common, we may look like our parents, brothers, sisters etc...
• Doctors can test embryos, fetuses and adults for certain alleles by genetic tests.

• Gene therapy could be used to treat some genetic disorders.

• Some organisms use asexual reproduction and have offspring that are clones.

• Animal clones are produced naturally and artificially.

• Cells in multicellular organisms become specialized very early in the organisms development.

• Stem cells can be used to treat certain genetic disorders.