LIFE 102 Lecture Notes - Lecture 36: Quantitative Trait Locus, Dwarfism, Zygosity
Document Summary
Inheritance of characters by a single gene may deviate from simple mendelian patterns in the following situations: When alleles are not completely dominant or recessive. When a gene has more than two alleles. Phenotypes of the heterozygote and dominant homozygote are identical. Phenotype of f1 hybrids is somewhere between the phenotypes of the two parental varieties. Red flower + blue flower = purple flower. Two dominant alleles affect the phenotype in separate, distinguishable ways. *a dominant allele does not subdue a recessive allele. *alleles are simply variations in a gene"s nucleotide sequence. *for any character, dominant/recessive relationships of alleles depend on the level at which we examine phenotype. Most genes exist in populations in more than two allelic forms. Responsible for the multiple symptoms of certain hereditary diseases. A gene at one locus alters the phenotypic expression of a gene at a second locus. Those that vary in the population along a continuum.
