DNA & Genetics Keywords 0.0 / 5 ? BiologyDNA, genetics and evolutionASEdexcel Created by: TxxWxrd1Created on: 17-01-21 13:31 Gene A section of DNA that codes for specific proteins 1 of 11 Locus Fixed position on a chromosome 2 of 11 Homologous Matched pair of chromosomes from each parent Same genes, different alleles 3 of 11 Alleles An alternative form of a gene that occurs at the same locus on homologous chromosomes Different variants of genes 4 of 11 Dominant Alleles Gene/trait that always appears or expresses itself; shown with a capital letter 5 of 11 Recessive Alleles Genes are recessive if the phenotype that they code for is only expressed when the genes are homozygous 6 of 11 Heterozygous The situation in which allelic genes are different Two different alleles 7 of 11 Homozygous The situation in which allelic genes are identical Two of the same alleles 8 of 11 Carrier When someone has the allele for a trait but it is not expressed 9 of 11 Genotype All of the alleles present at the locus 10 of 11 Phenotype Observable characteristics of an organism. 11 of 11
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