How does the distribution shown on the map of alleles for the B blood type support the hypothesis that there are no biological races of humans?
A) All human groups show the same frequency of this allele.
B) A distinct frequency pattern of this allele is found in each human group.
C) A gradient of frequency of the allele is found from its origin in Asia outward to Europe.
D) There's no pattern with respect to frequency of this allele throughout Asia and Europe.
C
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The ecological model that high reef fish diversity is due to niche diversity is called:
a. competition model. b. predation disturbance model. c. lottery model. d. resource limitation model. e. bet hedging model.
If you count 73 plaques on a bacterial plate after you had plated 0.1 ml of a 10–4 dilution of phage, what was the initial concentration of the (undiluted) phage?
What will be an ideal response?
When light hits a pigment, how many electrons are excited by a single photon?
a. one b. two c. three d. four
Neutrophils with defective lysosomes are unable to
A) undergo chemotaxis. B) migrate. C) produce toxic oxygen products. D) attach to microorganisms and other foreign material. E) engulf microorganisms and other foreign material.