Ch. 24 Quantitative Genetics Flashcards
What is another name for quantitative?
continuous
What is another word for qualitative?
discontinuous
What does qualitative mean?
only a few distinct phenotypes
What does quantitative mean?
varies continuously for many phenotypes
True or False: the environment has no effect on phenotype
False
True or False: in quantitative, each genotype may produce a range of possible phenotypes
True
Which two below are examples of quantitative?
threshold
meristic
These characteristics have a limited number of distinct phenotypes and can only be whole numbers
meristic
You have it or you don’t but with each category there is a continuous range
threshold
Quantitative characteristics controlled by cumulative effects of many genes
polygenic inheritance
What is the ratio for two complete heterozygotes in polygenic inheritance?
1:4:6:4:1
All variances add to be this
phenotypic variance
If all phenotypic variance is due to this, offspring would be exact intermediate of the parents
additive variance
What are the three components of genetic variance?
additive
dominance
genetic-environmental
What are the three main components of phenotypic variance?
genetic variance
environmental variance
genetic-environmental variance
proportion of phenotypic variance that is due to genetic variance
broad sense heritability
True or False: narrow sense heritability is VA?AP
True
True or False: heritability can be used on an individual basis
False
in R = h^2 (S), what is R
response to selection
in R = h^2 (S), what is S
selection differential
If I have a group where the average is 10, and I select a small subgroup of 12, what is true
S=2
The group of 8, I select a group where the average is 12, their offspring have an average of 15, what is true
R=7
If the population average is 5, and S is 9, what is the average for the selected group?
14
If the population has average 1, selected group has average 6, and R=8, what is the average in the offspring?
9
