Genetic Terminology 0.0 / 5 ? BiologyDNA, genetics and evolutionA2/A-levelAll boards Created by: Pheebzicles01Created on: 30-09-18 08:48 Heterozygous At a gene locus when its cells contain 2 different allele of a gene eg Bb 1 of 18 Epistasis Expression of one gene depends on the presence of one or more other gene 2 of 18 Chiasmata Point where maternal and paternal chromatids cross over 3 of 18 Dominant Allele that is expressed and seen even if only a single copy present eg B 4 of 18 Homozygous At a gene locus when its cell contains two of the same allele of a gene eg BB 5 of 18 Centriole Help to organize the assembly of spindle fibres during cell division 6 of 18 Genotype The genetic makeup of a cell, an organism, or a an individual 7 of 18 Codominant Both alleles expressed and seen eg AB 8 of 18 Centromere Pat of chromosome that links sister chromatids 9 of 18 Recessive Allele that is expressed and only seen when no dominant allele is present 10 of 18 Spindle Fibre lengths of microtubule that chromosomes during cell division attach to 11 of 18 Crossing over maternal and paternal alleles are swapped in prophase I 12 of 18 Allele Alternative form of a gene (one member of a pair) that is located at a specific position on a specific chromosome 13 of 18 Homologous The chromosome that pair up during meiosis 14 of 18 Linkage Genes that are found on the same chromosome 15 of 18 Phenotype Observable characteristics from the expression of an organism's genes as well as the influence of environmental factors 16 of 18 Chromatid Contains the replicated DNA of each individual chromosome, which are joined by a centromere 17 of 18 Locus Position of a gene along a chromosome 18 of 18
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