The frequency of heterozygosity for the sickle cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following?
A) Mendel?s law of independent assortment
B) Mendel?s law of segregation
C) Darwin?s explanation of natural selection
D) Darwin?s observations of competition
E) The malarial parasite changing the allele
Answer: C) Darwin?s explanation of natural selection
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Which pattern of diploid and haploid phases reflects the life cycle in some fungi and algae, but not plants or animals?
a. alternation between haploid and diploid generations b. two haploid generations followed by a diploid generation c. one haploid generation followed by two diploid generations d. a life cycle that limits the diploid state to a single cell produced by fertilization e. a life cycle that limits the haploid state to a single cell which is immediately fertilized
Each virus is classified into a genus based on its host, target tissue, and type of disease it causes.
Answer the following statement true (T) or false (F)
Large molecules such as polymers make good antigens
Indicate whether the statement is true or false
Patients that are HIV+ are at greater risk of ________ than the average population
a. cytolytic infections b. opportunistic infections c. latent infections d. virulent infections