In the 1940s, the population of whooping cranes in North America neared extinction, with fewer than 30 birds surviving. The population has since expanded to several hundred birds today
It is likely that these several hundred birds will exhibit very little genetic diversity. This is an example of A) biogeographical distribution.
B) the bottleneck effect.
C) random mutation.
D) population effect.
E) immigration.
B
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During fertilization which two items combine to form a fertilized egg?
a. I and II b. I and III c. I and IV d. II and IV e. III and IV
How might global warming affect the precipitation?
A) Deserts will receive more rainfall. B) Storms will increase in intensity. C) Months of snowfall in higher latitudes will increase. D) Rainfall near oceans will decrease.
Plasmodesmata of plant cells are functionally equivalent to the ____ of animal cells
a. vesicles b. gap junctions c. tight junctions d. anchoring junctions e. cell surface receptors
In contrast to the cell cycle of adult somatic cells, the dividing cells of an early embryo lack which cell cycle stage(s)?
A. S B. M C. interphase D. G1 and G2