BI226 Lecture Notes - Lecture 13: Human Height, Probability Distribution, Inbreeding
Document Summary
Quantitative traits: display continuous phenotypic variation, single gene traits commonly exhibit discontinuous phenotypic variation, creates very distinct categories, typically lead to 3:1 genetic ratios, polygenic traits show continuous variation, range of values in a continuum. Influenced by multiple genes as well as environmental factors: parents transmit a genetic potential to offspring, that may or may not be met depending on environment. Major genes and additive gene effects: multiple genes exert different amount of influence on phenotypes, a gene with several alleles influencing a phenotype is a major gene. Multiple gene hypothesis: segregation of alleles of multiple genes played role in phenotypic variation, used to describe genetic control of kernel colour. Allele segregation: quantitative traits tend to produce intermediates (i. e. a short and tall person will make an average height person, no gene-environment interactions means genotype corresponds to a distinct phenotype, gene-environment interaction creates a wider range of phenotypes.
