In the Chiricahua Mountains in Arizona, a species of spider is found in both the woodland
areas around streams and in the desert shrub areas. In the woodland areas, these spiders are
under constant threat of predation from birds. Because of this, they spend little time in the
exposed portion of their sheet webs. However, in the desert areas where birds are less of a
threat, spiders constantly forage in the exposed portion of their webs. Offspring of matings
between spiders from woodland and desert regions behave more like spiders from the desert
habitat, even if they are living in the woodland area. The offspring quickly fall prey to birds,
often before they have had a chance to reproduce. Over time, two different species arise.
What type of reproductive barrier led to this speciation event?
a. reproductive
b. geographical
c. temporal
d. mechanical
B
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A. 75 B. 10 C. 5 D. 25
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a. Conventional cell culture b. Enzyme immunoassays c. Reverse transcriptase polymerase chain reaction (RT-PCR) d. Shell vial culture
Chlorine compounds remain stable and effective in the presence of excess organic matter.
Answer the following statement true (T) or false (F)
All of the following are included in the modern concept of a biological species EXCEPT
a. genetic compatibility b. viable offspring c. fertile offspring d. gene flow inhibition e. reproductive compatibility