In female mammals, most genes on one of

the two X chromosomes are permanently
inaccessible, and this phenomenon is called
__________. Fill in the blank(s) with the appropriate word(s).


Answer: X chromosome inactivation

Biology & Microbiology

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How many copies of a specific allele does a somatic cell have?

a. 1 b. 2 c. 23 d. 46 e. 92

Biology & Microbiology

Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?

A) kinetochores B) Golgi-derived vesicles C) actin and myosin D) centrioles and centromeres

Biology & Microbiology

A laboratory experiment followed the growth of a flour beetle (Tribolium sp.) population over time. At first, the population increased dramatically, but later the growth slowed and the population size leveled off

Although food (the wheat flour in which they live) was still abundant, the flour beetles resorted to eating their own eggs when population densities got high. What can we conclude about cannibalism in this species? A) It is a density-dependent means of population control. B) It has no effect on the growth of the population, as food scarcity is clearly the limiting factor. C) It is a density-independent means of population control. D) We cannot reach any conclusions based on the information provided. E) It is clearly maladaptive, as populations always do best when their densities increase as much as possible.

Biology & Microbiology

The study of the cause of disease is known as (epidemiology/etiology/pathology)

What will be an ideal response?

Biology & Microbiology