To analyze genetic variation in populations, one approach is to consider the frequency of alleles. When calculating an allele frequency for a diploid species, how many copies of an allele are present?
A. 1
B. 2
C. 3
D. 4
E. 5
B. 2
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Tumor suppressor genes:
A. encode proteins that drive the cell cycle forward. B. encode proteins that suppress development. C. encode proteins that suppress cell division. D. encode proteins that suppress DNA repair. E. encode proteins that suppress metabolism.
DNA photolyase, in the presence of visible light, can repair DNA damage due to ultraviolet radiation.
Answer the following statement true (T) or false (F)
The tympanum and stapes are used in tetrapods for ____
a. seeing b. hearing c. heat-sensing d. tasting e. smelling
Ned is reading his newspaper by holding it at arm's length. Sandra asks him why he isn't holding it closer. He explains that he would not be able to see the print if he held it closer
Which of the following corrective measures would be the best solution for Ned? A) corneal ring segments B) retinal transplants C) convex lenses D) concave lenses