The heritability of a trait is the ____
a. sum of all phenotypic variation in a population
b. average amount of genetic variation in each individual
c. proportion of phenotypic variation that is caused by different genotypes
d. absolute measurement of genotypic variation in a population
e. proportion of phenotypic variation that is caused by the environment
c
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When a plant zygote first forms, it starts to develop and elongate after mitosis begins
a. True b. False
Replication of DNA
1.produces RNA molecules. 2.produces only new DNA. 3.produces two molecules, each half-new and half-old DNA joined lengthwise to each other. 4.generates excessive DNA, which eventually causes the nucleus to divide. 5.is too complex to characterize.
Chromosomes are duplicated during the ____ of the cell cycle
a. G1 phase b. G2 phase c. S phase d. metaphase e. prophase
Which limbic structure filters incoming sensory information and interprets it in the context of emotional needs and
survival? a. amygdala b. hippocampus c. basal ganglia d. hypothalamus e. thalamus