What is the Hardy-Weinberg equation?
a) an assessment of evolution at a particular locus
b) a determination of allele frequency
c) a determination of genotype frequency
d) an assessment of heterozygosity in a population
Answer: a) an assessment of evolution at a particular locus
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List the three major groups of pinnipeds and outline the anatomical differences between them
What will be an ideal response?
One way to kill a tree is to girdle it by cutting a groove a centimeter into the bark all around the trunk of the tree. The tree will typically survive that growing season, but will die over the winter. Which of the following is the best explanation for this observation?
A. The phloem was cut, so water and nutrients cannot be taken up to the leaves. B. The xylem was cut, so sugars cannot be transported to the roots. C. The phloem was cut, so sugars cannot be transported to the roots. D. The xylem was cut, so water and nutrients cannot be taken up to the leaves. E. The xylem was cut, which gives access to pathogens that kill the tree.
Which of the following does not influence the strength of a stimulus?
1.frequency of action potentials 2.how many axons are responding 3.size of the action potentials 4.which axons are responding
Which of the following carry impulses toward the cell body of a neuron?
Axons Dendrites Glial cells Schwann cells