Some traits evolve for one particular function, but then become co-opted for another function. For example, it is hypothesized that bird feathers originally evolved for thermoregulation/insulation, but then later became adapted for flight
In the text it is
suggested that evolution of group hunting resulted in a brain that is able to play the piano or
solve calculus problems. Please support or refute this statement.
What will be an ideal response?
Support:
Group hunting involves coordinating a complex series of events among individuals.
Selection would have favored groups that could perform such a complex task more
effectively, thus favoring the evolution of enhanced cognitive ability.
Refute:
Other types of animals hunt in groups (lions, wolves, killer whales) but cannot play the piano
or solve calculus problems.
TAKE HOME: It is a fortuitous combination of traits and circumstances that have resulted in
the suite of traits that are characteristic of humans. Evolution is not directed towards an end
goal.
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A researcher is studying several different Rhodnius mutants. One of her mutants only molts normally up until the 2nd nymph stage. After that, insects continue to molt but keep demonstrating body plans of the 2nd nymph stage
What is the likely effect of this mutation in Rhodnius? Choose all that apply. A. The juvenile hormone is not expressed B. The ecdysone hormone is not expressed C. The prothoracicotropic hormone (PTTH) is not expressed D. The juvenile hormone is over-expressed E. The ecdysone hormone is over-expressed F. The prothoracicotropic hormone (PTTH) is over-expressed
Biochemical evidence supporting our current model of muscle contraction includes the observation that
A) myosin binds calcium. B) titin binds calcium. C) actin has ATPase activity. D) myosin has ATPase activity. E) actin and myosin have the same molecular weight.
What cells secrete the proteins that make up the matrix of loose connective tissue?
A) hepatocytes B) fibroblasts C) chondrocytes D) osteocytes
The responses observed in type IV hypersensitivities result from the action of
A) IgE antibodies and mast cells. B) T cells and phagocytes. C) IgG and complement. D) autoantibodies. E) inflammatory chemicals.