Key Words 2.0 / 5 based on 1 rating ? BiologyGCSEEdexcel Created by: Daisy Hartland - DykesCreated on: 17-04-13 14:44 characteristic A distinguishing quality, trait or feature of an individual, thing, etc. 1 of 9 evolution The gradual change in characteristics within a species. 2 of 9 speciation Evolution of a new species due to geographical isolation or change in habitat. They can no long breed with the original species. 3 of 9 heterozygous Having different alleles of the same gene. e.g. Hh 4 of 9 homozygous Having two of the same alleles in a gene. e.g. HH or hh 5 of 9 sickle cell disease A genetic blood disorder caused by the presence of an abnormal form of haemoglobin. The red blood cells are a cresent shape. 6 of 9 homozygous recessive/dominant Having either two dominant or two recessive alleles. eg. HH or hh 7 of 9 punnett square A diagram that is used to predict an outcome of a particular cross or breeding experiment. 8 of 9 cystic fibrosis A hereditary disorder affecting the exocrine glands. - It cause excess mucus, sweat, saliva and digestive juices. 9 of 9
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