Which of the following cells is NOT infected by HIV?
A) helper T cells
B) microglia
C) B lymphocytes
D) macrophages
E) dendritic cells
C
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Two host races of apple maggots have appeared within the past 100 years. This suggests that they may
be undergoing
a. parapatric speciation. b. allopatric speciation. c. sympatric speciation. d. genetic drift. e. development of a hybrid zone.
Two STR loci were determined to have the following allele frequencies in the general population: STR A STR B Alleles: 1A: 0.1 1B: 0.4 2A: 0.55 2B: 0.4 3A: 0.25 3B: 0.2 4A: 0
1 A suspect in a criminal trial was genetically tested for these loci and was found to have the genotype (1A, 1A) for STR A and (2B, 2B) for STR B–homozygous for both loci. What is the probability that a randomly sampled person from this population would also have this genotype?
Which of the following nutrients is most closely linked to the energy cycle in ecosystems?
A) carbon B) nitrogen C) lead D) sulfur
Eugenic laws were an attempt to
A. introduce new genes into the human gene pool. B. improve the human gene pool. C. identify the genes in the human gene pool. D. reduce the size of the human population.