THE CONCEP

Notes

THE CONCEPT OF DOMINANCE - NOW Third: if the two alleles at a locus differ, then one (the dominant allele) determines the organism’s appearance, and the other (the recessive allele) has no noticeable effect on appearance. ●In the flower-colour example, the F1 plants had purple flowers because the allele for that trait is dominant. THE CONCEPT OF SEGREGATION ●Mendel’s 1st law of inheritance; “The contrasting factors for a given trait in an individual segregate (separate) when gametes (sex cells) are formed, and any single gamete receives only one factor for the trait.” MEIOSIS THE CONCEPT OF SEGREGATION - NOW Mendel’s 1st law of inheritance “The two alleles for a heritable character separate (segregate) during gamete formation and end up in different gametes.” GREGOR MENDEL DESCRIPTIONS ●Gene – character ●Allele – “units” or “factor” ●Dominant ●Recessive ●Locus ●Homozygous ●Heterozygous ●Phenotype ●Genotype ●Monohybrid cross MODERN TERMINOLOGY ●Gene – a specific segment of DNA ●Locus – a particular location of a gene on a chromosome ●Allele – one or more alternative forms of a gene at specific gene locus on homologous chromosomes ●Dominant allele – an allele t...