In most cases, pathogens leave the host via the portal of exit through:
a. sloughing
b. adhesion
c. discharge
d. secretion
e. diffusion
f. filtration
g. excretion
a. sloughing
c. discharge
d. secretion
g. excretion
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On the Hawaiian Islands, speciation in Drosophila occurred when a small group of males and females colonized a new
island, where they faced environmental selection pressures. In addition, sexual dimorphism – and therefore, sexual selection – maintained reproductive isolation from other populations on the new island. These populations, although closely related, remained ecologically different. These events are examples of ____.
a. a founder effect only b. genetic drift only c. adaptive radiation only d. a founder effect and genetic drift, but not adaptive radiation e. a founder effect, genetic drift, and adaptive radiation
When the anticodon of a tRNA and the codon of an mRNA interact, the two sequences are
A) identical. B) antiparallel. C) parallel. D) not related.
The presence of the strongest competitors in the
center of a group of animals may qualify the group for status as a(n) a. altruistic society. b. selfish herd. c. kin group. d. dominance hierarchy. e. sexual selection society.
A genetic counselor will know that the probability of having a child affected with a condition inherited as an
autosomal recessive would be: a. 0.5 or 50% if both parents were homozygous normal. b. 0.5 or 50% if both parents were heterozygous. c. 0.25 or 25% if both parents were homozygous normal. d. 0.25 or 25% if both parents were heterozygous. e. 0% if both parents were heterozygous.