The intermediate host for many flukes is a:
A. human.
B. cow.
C. dog.
D. cat.
E. snail.
E
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Mouse pigmentation is subject to epistasis of the B alleles by the d alleles. B (black) is dominant over b (brown), and
D is dominant over d. Homozygous d is epistatic to the black and brown genes. Given this information, what genotype(s) result in a white mouse (no pigment)?
a. BBdd only b. Bbdd only c. bbDD only d. bbDd only e. BBdd and Bbdd
The maintenance of the internal environment in a relatively stable state is called
1.consistency 2.homeostasis 3.negative feedback 4.thermoregulation
In an area with high soil nutrient availability, mycorrhizal fungi are
A) commensal. B) competitive. C) parasitic. D) neutral.
Spatial summation is characterized by:
a. several presynaptic neurons releasing neurotransmitter simultaneously. b. several presynaptic neurons releasing neurotransmitter in a sequential pattern. c. several postsynaptic neurons receive sequential inputs from several presynaptic neurons. d. a single presynaptic neuron firing multiple times in rapid succession. e. a single presynaptic neuron directly contacting several postsynaptic neurons.