AS Unit 2 Biology Quiz Part 1 Test your knowledge on the DNA section of the AQA AS Unit 2 Biology course. 3.0 / 5 based on 8 ratings ? BiologyASAll boards Created by: Eleanor BatesCreated on: 09-05-10 14:33 What is an allele? Two versions of the same gene 1 of 4 What introduces variation in MEIOSIS? Crossing Over and Independent Segregation 2 of 4 What is an homologous pair of chromosomes? Two chromosomes that determine the same characteristics 3 of 4 What makes up a nucleotide in the structure of the DNA molecule? Deoxyribose, Phosphate Group and An Organic Base 4 of 4
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