The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell
trait is an example of _______________.
A. natural selection D. heterozygote disadvantage
B. genetic drift E. more than one of these
C. spontaneous mutational spread
A
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Many seeds are capable of surviving in a dormant or quiescent state for many years, or even centuries. Such seeds are not usually damaged by environmental extremes that would kill most other organisms
What main adaptation prevents the seeds from germinating before they are dispersed, and allows them to survive until environmental conditions are favorable for germination and seedling growth? A) A seed coat B) Two cotyledons C) A large quantity of stored nutrients D) Desiccation to 2-20 percent water E) Double fertilization
The group of bacteria that can be described as being normal inhabitants of soil and water and primarily responsible for the decomposition of plant material is:
a. Rhodococcus. b. Nocardia. c. Gordonia. d. Tsukamurella.
chronic constipation can lead to enlarged and inflamed blood vessels of the anus known as
What will be an ideal response?
Which of the following is characteristic of prokaryotic genomes but NOT eukaryotic genomes?
A) histones B) circular chromosomes C) linear chromosomes D) enclosed in a nuclear membrane E) typically consist of a few to several chromosomes