DNA and Chromosomes 0.0 / 5 ? BiologyDNA, genetics and evolutionASAQA Created by: AliceCreated on: 28-05-14 12:25 Why do homologous pairs form? Always an even number of chromosomes. One of each pair from maternal chromosomes, one from paternal chromosomes. Total number is diploid number. 1 of 6 What is an allele? Genes code for information with specific base sequences - come in several forms called alleles 2 of 6 Different alleles... ...code for different polypeptides 3 of 6 If there is a difference in base sequence of an allele of a gene, what results? A difference in amino acid sequence, producing different proteins/polypeptides 4 of 6 What happens during packaging by histones? DNA molecule combined with proteins. Forms coiled DNA-protein complex. Coils fold to produce loops, loops coil and pack together to form chromosomes. 5 of 6 If a eukaryotic cell has a true nucleus with protein packaging histones to form chromosomes, with large linear DNA, what does a prokaryotic cell have? Smaller DNA which is circular, with no true nucleus or proteins. 6 of 6
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