If the heterozygous genotype is favored (as exhibited by the sickle cell allele in malaria-prone regions), selection results in a ________ in which alleles reach stable equilibrium frequencies that are maintained by the ongoing action of selection
against the homozygous genotypes. Fill in the blank(s) with correct word
balanced polymorphism
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In humans, the stomach secretes (select all correct choices):
A. pepsin, an enzyme that digests proteins. B. enzymes that digest lipids. C. hydrochloric acid. D. amylase. E. cellulase.
In the accompanying figure, which of the following represents a multicellular, haploid reproductive stage?
a. 1 b. 2 c. 3 d. 4 e. 5
The work of Beadle and Tatum
1.showed that one gene seemed to affect one enzyme. 2.showed that protein was the genetic material. 3.showed that each gene seemed to affect several enzymes. 4.showed that DNA was the genetic material. 5.showed that each enzyme contained just one polypeptide.
Tubulin may assemble onto one end while disassembling from the other end of the same microtubule simultaneously in a process known as
A) dynamic instability. B) treadmilling. C) nucleation. D) oligomerization. E) catastrophe-rescue.