Lecture 12 Quantitative Genetics

Question 1

Quantitative trait
(definition)
(what determines)

Answer 1

Phenotype with continuous variation.

Multi factorial: Phenotype = Genotype + Environment

Question 2

Genetic effects (Genotype)
Polygenic
Quantitative trait locus (QTL)
Each QTL can have… (3)
Additive inheritance (Incomplete dominance effects) (VA)

Answer 2

Polygenic: traits controlled by many genes
Quantitative trait locus (QTL): one of the many loci that cumulatively contribute to a quantitative trait

Each QTL can have…
Dominance effects (VD)
Epistatic effects (VI)
Additive inheritance (Incomplete dominance effects) (VA)

Multiple independently segregated genes contribute to a trait, with each allele having an independent phenotypic effect.

Question 3

Environment

Answer 3

even the same genotype can form a normal curve