The age structure diagram for countries with a 1.5
total fertility rate is indicated by
a. A.
b. B.
c. C.
d. D.
e. none of these.
Answer: d
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The rRNA gene sequences of hyperthermophilic Archaea and Bacteria have diverged ________ over time, likely due to ________
A) relatively little / strong constraints on sequence changes at higher temperatures B) substantially / higher mutation rates at higher temperatures C) relatively little / low mutation rates in these ancient organisms D) substantially / DNA damage at higher temperatures
_____ mutations affect only the individual in which they occur; _____ mutations are passed from parent to offspring
A. Somatic; germ-line B. Germ-line; somatic C. Germ-line; heritable D. Somatic; point E. Point; germ-line
Axons forming the optic nerve are derived from ____
a. amacrine cells b. horizontal cells c. bipolar cells d. vertical cells e. ganglion cells
In a fish population in a shallow stream, the genotypic frequency of yellowish-brown fish and greenish-brown fish changed significantly after a flash flood randomly swept away individuals from that stream. This change in genotypic frequency is most likely attributable to
a) gene flow b) disruptive selection c) directional selection d) genetic drift e) natural selection