Inherited change 0.0 / 5 ? BiologyDNA, genetics and evolutionA2/A-levelAQA Created by: aarafa11Created on: 14-11-18 20:25 Define genotype The genetic combination that each organism has 1 of 15 Gene A section of DNA on a chromosome that usually codes for a particular polypeptide 2 of 15 Mutation A change in the sequence of DNA bases which changes the genetic code 3 of 15 Allele A different variation of a gene 4 of 15 Multiple Alleles A gene that has two or more possible versions 5 of 15 Co-dominance When a gene has two dominant alleles which are both expressed. 6 of 15 Dominant Allele An allele that is always expressed in the phenotype of an organism. It only need one of the allele for it to b expressed 7 of 15 Recessive Allele An allele only expressed when in a homozygous pair. 8 of 15 Monohybrid investigations that examine the inheritance of a single characteristic: 9 of 15 Dihybrid investigations that examine the inheritance of two characteristics 10 of 15 Linkage when two or more genes are located on the same chromosome 11 of 15 Autosomal linkage Linked genes which are on non-sex chromosomes 12 of 15 Sex linkage linked genes are on sex chromosomes - therefore specific characteristic is more likely to be inherited in either male or female offspring 13 of 15 Epistasis interaction of non-linked genes where one masks the expression of the other. 14 of 15 Chi-squared test statistical test to find out whether the difference between observed vs expected data is due to chance or ‘goodness of fit’ of a hypothetical model. 15 of 15
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