Why is it hypothesized that sexual selection is responsible for most of the variation seen in the human population?
A. because much of the variation is in visible
characters
B. because humans are unique when it
comes to sexual selection
C. because mutations are so rare in humans
D. because mutations typically take place
after reproduction has occurred
A
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F+ strains of Escherichia coli
A) do not have an F factor. B) have the F factor as a plasmid. C) have an integrated F factor. D) transfer the F factor to recipient cells at a high frequency.
Darwin produced a well respected monograph on:
a. mussels. b. sea lizards. c. Galapagos turtles. d. barnacles. e. marine fossils.
What tissue conducts water and dissolved minerals from the roots to the stems and leaves?
a. collenchyma b. epidermis c. periderm d. xylem e. phloem
The limited number of bacterial strains that are susceptible to infection by a specific phage are referred to as the ___________ of that bacteriophage.
A) host range B) phage strain C) plaques