Ch 28 - Complex Quant Traits Flashcards
(14 cards)
def quan traits
any trait that varies measurably in a given specifies.
meaning not A or B; think height (which is on a spectrum); how many eggs will your chickens lay.
types of quan traits (4)
anatomical
physiological
behavioral
diseases
def continuous traits
quan traits that don’t fall into discrete categories;
ex: height & weight
def meristic traits
can be expressed in whole numbers
ex: number of bristles on drosophila back
diseases often are ______ traits (meaning inherited due to the contribution of many genes)
threshold
know how to calculate variance
slide 6 of ch 28 lecture
polygenic inheritance def
exhibit a continuum of phenotypic variation
refers to the transmission of trains that are governed by 2+ genes
locations on chromosomes that affect the outcome of the quan traits are called ____
quan trait loci (QTLs)
- QTLs may contain single gene affecting quan trait, or two+ closely linked genes
what was the result of Nilsson-Ehle’s experiment f2 crossing true-breeding red & white flowers? how do we describe these results?
lots of variation in the amount of red in the offspring
additive
when is it difficult to categorize several discrete genotypic categories? why is this?
1) 3 of genes controlling the trait increases
2) influences of environment increases
creates overlap of polygenic traits
T/F geneticists can determine the relative amount of quan traits that are controlled by genetics vs environment
false
Instead, the focus is on how variation, both genetic and
environmental, will affect the phenotypic results
how do you calculate phenotypic variance? slides 29 - 31
you don’t need to know this for the test
how do you calculate phenotypic variance? slides 29 - 31
psyche! you don’t need to know this for the test
narrow sense heritability vs broad sense
slide 32 & 33
