Key Words (3.4.8) 0.0 / 5 ? BiologyDNA, genetics and evolutionA2/A-levelAQA Created by: Kristina WrightCreated on: 05-11-13 18:10 Allele a variant/form of a gene 1 of 14 Allele Frequency The no. of times an allele occurs within the gene pool 2 of 14 Co-dominance conditions in which both alleles for one gene in a heterozygous organism contribute to the phenotype 3 of 14 Diploid cells in which the nucleus contains two sets of chromosomes 4 of 14 Dominant an allele that is always expressed in the phenotype 5 of 14 Gene length of DNA on a chromosome normally coding for a particular length of polypeptide 6 of 14 Gene Pool total no. of alleles in a particular population out a specific time 7 of 14 Genotype the genetic composition of an organism 8 of 14 Haploid cells that contain only a single copy of each chromosome (e.g. gametes) 9 of 14 Heterozygous condition in which the alleles of a particular gene are different in a chromosome 10 of 14 Homozygous condition in which the alleles of a particular gene are identical 11 of 14 Mutation a change in the sequence of bases of DNA 12 of 14 Phenotype the characteristics of an organisms, often visible, from both its geneotype and the effects of the environment 13 of 14 Recessive an allele only available in the phenotype if homozgous 14 of 14
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