Biology- Genetic Variation and Disorders 0.0 / 5 ? BiologyDNA and inheritanceGCSEAQA Created by: Emily1Created on: 10-09-13 16:27 Genes can exist as different forms called: Alleles 1 of 7 Polydactyly is caused by a: Polydactyly is caused by a dominant allele. 2 of 7 Cystic fibrosis is caused by: A recessive allele 3 of 7 In a genetic diagram, how is a dominant allele shown? As a capital letter 4 of 7 Identical twins are very similar to each other mainly because: They have identical genetic information 5 of 7 You need two copies of the faulty allele to have cystic fibrosis because: The allele is recessive 6 of 7 A gene is a section of: DNA 7 of 7
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