allele - A version of a gene , chromosome - coiled DNA split into sections called genes, mutation - where the DNA within cells have been altered, gametes - the male and female sex cells, genes - section of DNA that codes for a particular characteristic , auxin - A plant hormone that controls the response to light or gravity, ethene - A hormone sprayed on fruit to ripen, phototropism - A plant responding to light, hypothermia - condition where the body gets too cold; pulse rate slows down and causes violent shivering, carbon monoxide - a chemical in tobacco smoke which stops red blood cells from getting oxygen , geotropism - A plant responding to gravity, synapse - gap between two neurones, retina - images form here, an area which is sensitive to light, cornea - refracts light rays,

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