The continuous, low-level extinction rate of species is referred to as:
a. minimal extinction.
b. mass extinction.
c. background extinction.
d. temporal extinction.
e. selective extinction
C
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In Drosophila melanogaster the allele for red eyes is dominant over the allele for purple eyes, and the
allele for a gray body is dominant over the allele for a black body. A testcross was done to check for genetic linkage between the genes for these traits, with the following results for the offspring:478 flies with red eyes and a black body 27 flies with red eyes and a gray body 462 flies with purple eyes and a gray body 33 flies with purple eyes and a black body Which of the choices below best represents the map distance between the genes for these two traits?
a. 50.0 map units b. 30.0 map units c. 47.0 map units d. 27.0 map units e. 6.0 map units
Which layer of sedimentary rock shows the
presence of fish?
a. Unkar Group b. Manakacha Formation c. Kaibab Limestone receptors d. Redwall Limestone e. Chuar Group
Physical deterrents on plants discourage the interspecific interaction called ________.
Fill in the blank(s) with the appropriate word(s).
Figure 46.2
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The following question refers to the accompanying figure illustrating a tallgrass prairie food chain.
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The letter D indicates the ____.
A. first trophic level B. second trophic level C. third trophic level D. fourth trophic level E. fifth trophic level