In a lake, a certain native species of zooplankton is found evenly distributed in the water column. After
introduction of a different species of zooplankton, the native species is only found in the shallow water
zone. This is most likely an illustration of:
a. character displacement.
b. species richness.
c. primary succession.
d. secondary succession.
e. competitive exclusion.
E
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What might be the outcome of repeated duplications of one or a few genes in a species' genome?
A) tetraploidy B) semisterility C) the presence of gene families D) repetitive DNA that is of no use to the cell E) fusion of segments of two chromosomes into one
People homozygous for a specific high-risk allele of thefto gene ____
a. tend to overeat b. store more fat c. are naturally heavier d. are always overweight e. cannot undergo gastric bypass surgery
Which of the following plants is not an annual?
a. corn b. geranium c. sunflower d. marigold e. carrot
The synthesis (S) phase is characterized by
A.) DNA replication B.) cell division C.) replication of mitochondria and other organelles D.) the division of the cytoplasm