Darwin proposed that natural selection occurs in an environment by
A. favoring those individuals with the most favorable acquired characteristics.
B. resisting the environment and keeping the environment from changing.
C. producing a constant number of offspring while in that environment.
D. surviving for a fixed amount of time.
E. favoring heritable features that make the organism better suited to survive and reproduce.
Answer: E
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A. haploid. B. diploid. C. dihybrid. D. homozygous. E. heterozygous.
A poorly understood, yet promising type of vaccine that causes the host to produce microbial antigens for a short time involves the use of
A. subunits. B. DNA. C. alum. D. toxoids. E. glycoproteins.
Among the eukaryotic microbes in the phytoplankton, the ________ are most noted for their contribution to carbon fixation.
A. dinoflagellates B. diatoms C. cyanobacteria D. green algae
Consider a diploid organism. What is the genotypic ratio expected to be observed in the offspring produced by two heterozygous parents?
a. 3 homozygous dominant : 1 homozygous recessive b. 2 homozygous dominant: 2 homozygous recessive c. 2 homozygous dominant: 1 heterozygous: 1 homozygous recessive d. 1 homozygous dominant: 2 heterozygous: 1 homozygous recessive