Week 2 - Quantitive Genetics Flashcards
Traits that are controlled by many loci of small effect are called -
Quantitive
Which traits fall into Quantitive genetics?
Height, weight, colour etc
What’s continuous variation?
A gradual change in characteristics across a population
What two values do heritability values range between?
0 - 1
What value does var (G) / var (P) give you an indication of?
Heritability
Which of the following are components of var (G)? Select all that apply.
Additive genetic variation
canalisation
dominance
epistatis
fluctuating assymetry
- additive genetic variation
- dominance
- epistasis
What’s epistasis?
the effect of a gene mutation is dependent on the presence or absence of mutations in other genes
What does response to selection depend on?
- heritability
- selection differential
- genetic interval
What’s genetic interval?
the average age of parents at birth of their offspring
Whats selection differential?
difference between the mean of the selected group and the mean of the population
How do you estimate the heritability of a trait?
Full sib/half sib analysis
Parent-offspring regression
Pedigree analysis
Selection experiments
If you perform a parent offspring regression, what value gives you the estimate of the heritability of the trait?
The slope of the line
What is the name of this equation? R= h2*S
Breeders Equation
What is the ultimate origin of genetic variation?
Mutations
What is it called when genotypes respond differently to environmental gradients?
Genotype by environment interactions
