The results in Figure 18-3 support the conclusion that:
a. natural selection does not occur in guppies.
b. natural selection can occur in guppies within a few generations.
c. predation is not a selective force in determining the average size of guppies.
d. male body weight increased proportionately more than female body weight.
e. in the experimental setting, the guppies produced fewer, larger offspring
B
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The most likely identification of an anaerobic gram-positive bacillus that is a very large fusiform bacillus with one pointed end and one blunt end is:
a. Eubacterium. b. Veillonella. c. Leptotrichia. d. Propionibacterium.
Gene therapy has been successful in curing some individuals of autoimmune disorder and sickle cell
disease.
Indicate whether the statement is true or false.Scientists studying the causes of a type of progressive hearing loss known as otosclerosis want to identify the genetic contribution to the disorder. By which of the following are they most likely to find a causative gene or genes?
A) a genome-wide association study with a large number of SNPs, using pooled DNA samples B) genome-wide linkage analysis studies of families whose members have otosclerosis C) a candidate gene case-control association study with genes known to be involved in ear development D) comparison of gene expression among otosclerosis patients E) allelic heterogeneity studies for a gene expected to be involved
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many electrons does boron have?
A) 11 B) 15 C) 5 D) 2