Define and give an example of convergent evolution
What will be an ideal response?
Convergent evolution occurs when unrelated or distantly related organisms develop similar characteristics in response to environmental pressures. In this way, they seem to have filled similar niches, but in different geographic areas. One example is the flying squirrel in North America, and the sugar glider (a marsupial) in Australia.
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Autosomal aneuploidies arise by:
a. chromosome breakage and rejoining. b. nondisjunction. c. errors in crossing-over. d. mistakes in chromosome replication. e. mutations.
For an individual with the XXY chromosomal composition, the expected number of Barr bodies in interphase cells is ________
A) three B) two C) one D) variable E) zero
The rate of an enzyme reaction is the
A. optimum number. B. substrate number. C. turnover number. D. activation number.
A 25-year-old woman is seen on an emergency basis while in shock, with generalized flushing of the skin and mucous membranes. A tampon is present in her vagina. Toxic shock syndrome is suspected. Which of the following mechanisms is responsible for the toxic shock syndrome?
A. Inhibition of acetylcholine release B. ADP ribosylation of ribosomal protein C. Stimulation of G protein D. Cross-linking of MHC II and TCR proteins E. Activation of adenylate cyclase