Ch6 Evolution and Adaptation1.pdf

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University College Courses
Spencer Barrett

BIO120H © Lis| Page 111 chapter 6: EVOLUTION AND ADAPTATION  THE PHENOTYPE IS THE OUTWARD EXPRESSION OF AN INDIVIDUAL’S GENOTYPE  genotype: the genetic characteristics that determine the structure and functioning of an organism  phenotype: the physical expression of an organism’s genotype in its structure and function; the outward appearance and behaviour of the organism Genetic Variation  allele: one of several alternative forms of a gene  heterozygous: containing two different alleles of a gene  homozygous: containing two identical alleles of a gene  dominant: an allele that masks the expression of another (recessive) allele of the same gene  recessive: referring to an allele whose expression is masked by an alternative (dominant) allele of the same gene Sources of Genetic Variation  mutation: any change in the genotype of an organism occurring at the gene, chromosome, or genome level; usually applied to changes in the sequence of the nucleotides of DNA
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