Changes in tool-kit gene expression (i.e. Hox genes) has been important in what events?
A. The diversification of body plans in arthropods.
B. The development of the vertebrate jaw.
C. The diversification of mollusk body plans.
D. All of the above.
Ans: D. All of the above.
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It would be an advantage to have the absence of petals (or reduced petals) in a plant that
distributes pollen via
a. animals. b. humans. c. water. d. wind.
In the mammalian digestive system, what is the primary site of nutrient absorption?
A. large intestine B. pharynx C. stomach D. pancreas E. small intestine
Sexual reproduction in eukaryotes increases genetic variation. In prokaryotes, transformation, transduction, and conjugation are mechanisms that increase genetic variation
A fundamental difference between the generations of genetic variation in the two domains is: A) Eukaryotes are able to generate mutations in response to environmental stress while prokaryotes only generate random variation. B) Eukaryotic variation occurs primarily within a single generation while prokaryotic variation occurs over many generations. C) Crossing over is a major mechanism in creating genetic variation in prokaryotes while independent assortment is a major mechanism is eukaryotes. D) Eukaryotic genetic variation occurs with vertical gene transfer while prokaryotic genetic variation occurs with horizontal gene transfer.
Homo sapiens have existed on earth for 2% of the earth's history.
Answer the following statement true (T) or false (F)