Which two relatively recent extensions to QTL mapping center on molecular definitions of phenotypes with quantitative traits?
What will be an ideal response?
expression QTLs that assess RNA output; protein QTLs that assess protein output
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Once a threshold is reached,
a. the number of sodium gates that open depends upon the strength of a stimulus and its duration. b. a graded local potential will be unable to spread to a trigger zone of the nerve membrane. c. the resting potential of a neuron is restored. d. potassium channels in the input zone open. e. progressive opening of more and more sodium gates and the accompanying flow of sodium ions is an example of positive feedback.
What are the principal structural components of cilia and flagella?
a. intermediate filaments b. myosin microfilaments c. actin microfilaments d. microtubules
"Boy! You can line up all these homologous pairs of chromosomes in a lot of different ways!" This process is referred to as
A. segregation. B. synapse. C. independent assortment. D. crossing-over.
The major difference between protostomes and deuterostomes is the
A) presence or absence of cephalization. B) type of body symmetry. C) way the body cavity forms. D) presence or absence of a coelom. E) presence or absence of tissues.