BSC 1005 Lecture Notes - Lecture 14: Abo Blood Group System, Dihybrid Cross, Gregor Mendel
Document Summary
Read textbook sections: 13. 1 - 13. 2 & 13. 4 - 13. 7. Phenotype, genotype, gene, locus, allele, dominant, recessive, homozygous, heterozygous, Character, trait, monohybrid, dihybrid, pleiotropy, epistasis, multiple alleles, abo blood types, Phenotype: an individual"s observable traits: ex: freckles. Genotype: genetic factors responsible for phenotype: ex: ff / ff. Gene: a region of dna, which is inherited. Allele: alternative forms of a gene that determine the expression of some particular characteristic e. g. flower color red or white. Locus: a specific position or location on a chromosome. Homozygous: both alleles are the same (aa or aa) {true breeding} Phenotype is dependent upon the relationship between the two genes present. Gregor mendel: conducted experimental crosses with pea plants. Dominant: a dominant gene will appear in the phenotype even in the heterozygous condition. Complete dominance: the dominant allele expressed whenever present, either alone, or in a pair. The recessive allele makes no contribution to the phenotype.
