Genetic definitions 0.0 / 5 ? BiologyDNA, genetics and evolutionA2/A-levelAQA Created by: naima11Created on: 11-02-17 10:49 DNA DeoNucleicAcid 1 of 21 Haploid (n) Cells which contains an unpaired no. of chromosomes eq. sperm and egg cells 2 of 21 Diploid (2n) Cells which contain double sets of chromosones 3 of 21 Gene A segment of DNA which codes for a specific protein that gives a characteristic eg coloured eyes 4 of 21 Allele A different form of the same genev 5 of 21 Gene Pool All the alleles of all the genes of all the individuals in a population at any given time 6 of 21 Allele frequency No. of times an allele occurs within the same gene pool 7 of 21 Multiple Alleles Genes with more than one allele 8 of 21 Gene locus (loci) Position of the gene on the chromosone 9 of 21 Homologous Chromosones A pair of chromosomes containing the same genes, each derived from one parent 10 of 21 Homozygous Alleles which are the same e.g. TT or tt 11 of 21 Heterozygous Alleles which are different eg Tt 12 of 21 Genotype The alleles that an individual inherits 13 of 21 Phenotype The expression of this genetic constitution and its interaction of the environment 14 of 21 Dominant Allele Always expressed in the phenotype. the genotype could be heterozygous or homozygous 15 of 21 Recessive Allele Only expressed when homozygous 16 of 21 Co-dominance Both alleles are expressed in the phenotype 17 of 21 Monohybrid inheritance The inheritance of a characteristic controlleed by a single gene 18 of 21 Dihybrid inheritance The inheritance of a characteristic controlled by two different genes 19 of 21 Hardy-Weinberg Calculates frequency of 2 characteristics controlled by 2 different genes 20 of 21 Principle It predicts the proportion of dominant and recessive alleles of a gene in a population 21 of 21
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