In their study of the heritability of autistic traits among Dutch teens, Rosa Hoekstra and her colleagues were careful to choose participants from a variety of backgrounds and circumstances. Why is careful sampling especially important to studies of heritability?
a. The effects of heritability are most obvious in populations that exclude extreme environmental conditions, such as affluent or very poor families.
b. Environmental influences are magnified in extreme environmental conditions, such as among affluent or very poor families.
c. Extremes of environmental conditions, such as affluent or very poor families, tend to magnify the influence of heritability.
d. These precautions are really not relevant, because heritability cannot be assessed experimentally.
Question 2
What causes muscles to twitch?
a. depolarization of the muscle fiber produced by an influx of sodium ions
b. depolarization of the muscle fiber produced by an influx of potassium ions
c. hyperpolarization of the muscle fiber produced by an influx of calcium ions
d. hyperpolarization of the muscle fiber produced by an outflow of potassium ions
Ancestral versus shared derived characters involving morphological traits.
This red-bellied lemur shows clearly the traits that characterize strepsirhine primates.
Five Factors of Personality and the Traits they Include
Traits Selected for Study by Mendel
Representative Recessive and Dominant Human Traits
Human X- Linked Traits