In tomatoes, red (R) is dominant to yellow (r), tall (D) is dominant to dwarf (d), and smooth (H) is dominant to hairy (h). How many possible different phenotypes are there in relationship to these three characteristics?
A. 6
B. 8
C. 9
D. 16
E. 27
Answer: B
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Consider two islands located an equal distance from the mainland (colonization source). One island is large, the other is small. Which island will have a higher rate of change in species composition?
A. the small island B. the large island C. The rate of change in species composition will be the same on both islands. D. Species composition does not change at equilibrium.
The rat ?-tropomyosin (?-Tm) gene produces nine different mature mRNA proteins from a single gene using which three "alternative" mechanisms?
What will be an ideal response?
Which of the following DNA sequence elements coordinates the expression of nonadjacent genes in eukaryotes?
A) activation domains B) response elements C) epigenetic sequences D) coactivating elements E) DNase I hypersensitive sites
Generally speaking, vaccinations are effective in combating future infections because they induce the production of
A. mutations in the host genome. B. prostaglandins. C. helper T cells. D. neutrophils. E. memory cells.