practical 6 Flashcards
(20 cards)
what is quantitative genetics
it is the study of traits that can be described numerically 
what are quantitative genetic traits controlled by?
They are controlled by more than one gene and are significantly influenced by environmental factors
What are complex traits?
they are traits known as quantitative genetics and are controlled by more than one gene and are significantly influenced by environmental factors
are quantitative traits continuous or discreet?
They are continuous
What are discontinuous traits?
They are traits that fall into two or more discrete categories
ex. white eye or red eye
What is frequency distribution?
It is a way to describe quantitative traits where it shows the variation of the traits in a normal distribution
what is heritability?
It is the amount of phenotypic variation with a group of individuals that is due to genetic variation
how do you calculate the total phenotype variation?
Vp= Vg(variation from genetics) + VE (variation from environment)
how do you calculate broad sense heritability?
VG/Vp
if the variation due to genetics is very high and the variation due to the environment is low, what does this mean for promoting variation in a species
genetics is a more important cause of variation.
if the variation due to genetics is very low and the variation due to the environment is very high, what does this mean for the variation in a species?
the environment plays a more important role in
what does a heritability value of 1 mean
it means that all of the phenotypic variation is due to genetic variation
if the heritability is 0, what does this mean
all phenotypic variation is due to the environment
what is the purpose of using clonal populations for heritability tests
you can use it as a control group, since the clonal populations are identical genetically, the only source of variation will be the environment. This allows you to determine the variation of the environment and then figure out the variation from genetics in a heterogenous population
(Vp= VG+ VE)
What is narrow sense heritability
it is the heritability of a treat due to the additive effects of alleles
What is the assumption when measuring narrow sense heritability
The majority of genetic variance in the population of being studied is due to alleles that have additive effects

What does the correlation coefficient measure? (what is it looking for in parents vs offspring)
to what degree does the variation for one group predict the variation in another?
how well does the variation in the parent population predict the variation in the offspring 
What is the expected correlation for variation in parents to offspring due to genetics alone?
0.5
how is narrow sense heritability measured
observed variation/expected variation
