Which parts of the human eye are adjustablethat
is, they can be adjusted to accommodate
light and/ or images?
a. the cornea
b. the iris
c. the lens
d. the cornea and the lens
e. the lens and the iris
E
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The mutation that causes the lighter skin color
of all people of European descent was the result of what type of mutation?
a. base-pair substitution b. insertion c. deletion d. whole chromosome duplication e. multiple gene mutations involving several mechanisms
Approximately how many rainforest species become extinct every minute?
a. one b. two c. five d. ten e. twenty
The conjugation bridge in an Hfr × F? mating usually breaks before chromosome transfer is complete; however, because at least part of the plasmid is transferred first, the recipient becomes F+.
Answer the following statement true (T) or false (F)
Mountain, basin, and hybrid sagebrush were each raised in the three different habitats where they are found. What is likely to happen to the hybrid zone?
a. It will disappear because the basin population will move up the mountain and replace the hybrids. b. It will disappear because the mountain population will move down the mountain and replace the hybrids. c. It will disappear because the basin population will move up and the mountain population will move down the mountain and replace the hybrids. d. It will persist because the hybrids have the highest fitness in the hybrid zone.