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BIOS 280 Exam 2; Questions and Answers Already Solved
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BIOS 280 Exam 2; Questions and Answers Already Solved
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BIOS 280 Exam 2; Questions and Answers AlreadySolved
1. The evolutionary loss of hindlimbs in snakes involved genetic changes that
a. eliminated all the genes involved in building limbs
b. suppressed expression of fgf8 and ssh in embryonic limb buds
c. increased expression in limb buds of genes such as noggin that inhibit production of bone
cells
d. increased the thickness of the skin so that developing limbs could not penetrate it
Correct Ans-suppressed expression of fgf8 and ssh in embryonic limb buds
2. All instances of speciation require
a. adaptive radiation
, BIOS 280 Exam 2; Questions and Answers Already
Solved
b. genetic isolation and evolutionary divergence
c. geographic subdivision of a population
d. evolutionary divergence and reinforcement Correct Ans-genetic isolation and
evolutionary divergence
3. The evolutionary loss of hindlimbs in whales involved genetic changes that eliminated the
hindlimb bud's _____________, which in turn suppressed ___________________.
a. expression of the growth hormone gene, growth
b. expression of nos and bcd, formation of the proximal-distal axis
c. carapacial ridge, expression of ssh
, BIOS 280 Exam 2; Questions and Answers Already
Solved
d. zone of polarizing activity, the apical ectodermal ridge. Correct Ans-zone of polarizing
activity, the apical ectodermal ridge.
4. The biological species concept is difficult or impossible to apply to
a. fossil organisms and asexually reproducing organisms
b. large organisms and polymorphic populations
c. sexually reproducing organisms and parasites
d. plants and tetrapods Correct Ans-fossil organisms and asexually reproducing organisms
By choosing to mate with a male that presents a superior "nuptial gift," a female hangingfly
gains _____________________ consisting of____________________
a. an indirect benefit, increased duration of copulation
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