If the low number of hybrid flies in the hybrid zone, relative to the number of D. santomea flies there, is due to the fact that hybrids are poorly adapted to conditions in the hybrid zone, and if fewer hybrid flies are produced with the passage of time,
these conditions will most likely lead to _____.
A) fusion
B) reinforcement
C) stability
D) further speciation events
Answer: B
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The process of clonal selection gives rise to short-lived clones called ________, which combat the antigen that stimulated their production.
A) helper cells B) antibodies C) memory cells D) effector cells E) antigens
Mary died suddenly of an aortic aneurysm (the sudden bursting of one of the body's largest blood vessels). Which of the following conditions should her children worry most about?
A) hemophilia B) Turner syndrome C) Marfan syndrome D) albinism
Eating food contaminated with ________ may result in meningitis in at-risk persons.
A. Mycoplasma hominis B. Staphylococcus aureus C. Listeria monocytogenes D. Clostridium perfringens E. Enterococcus faecalis
Differences in chromosomal arrangements (such as inversions and translocations) between species can result in postzygotic isolation because:
a. hybrid zygotes die early. b. hybrids are inviable. c. hybrids are sterile. d. hybrids are behaviorally isolated from their parents.