Which type of selection would lead to two distinct phenotypes?
A. Stabilizing selection
B. Phenotype selection
C. Fitness selection
D. Disruptive selection
E. Directional selection
D
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How is the control of gene expression different between methylation of histone proteins and direct methylation of DNA?
What will be an ideal response?
Tay-Sachs disease
a. is controlled by a simple recessive gene. b. is a sex-linked disease more common in males. c. occurs only in those individuals that receive two copies of a defective recessive gene. d. is the result of the failure of chromosomes to separate so that an individual receives three instead of two chromosomes. e. depends on which parent passes the gene to the child.
____________________ molecules are responsible for the phenotype of an organism. Fill in the blank(s) with the appropriate word(s)
Neurotransmitters that open Na+ channels and trigger action potentials in receiving cells are called
A) inhibitory. B) excitatory. C) sympathetic. D) parasympathetic.