Mutation and migration introduce new alleles into populations. What is the most likely principal force that will shift allelic frequencies within large populations?

What will be an ideal response?


natural selection

Biology & Microbiology

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In RNAi, imperfect pairing of miRNA to target mRNA results in ____ while perfect pairing of miRNA to target

mRNA causes ____.

a. blocking transcription of the target mRNA; mRNA degradation b. blocking translation of the target mRNA; mRNA degradation c. recruitment of siRNA; blocking translation of the target mRNA d. mRNA degradation; recruitment of siRNA e. blocking transcription of the target mRNA; blocking translation of the target mRNA

Biology & Microbiology

Approximately how many neurons comprise the human brain?

a. 1,000 b. 50,000 c. 100,000 d. 75,000,000 e. 86,000,000,000

Biology & Microbiology

Across the lifespan of a human female, the number of primary oocytes peaks at the onset of puberty.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Oligotrophic lakes have:

A) clear water with high production. B) high nutrient levels and high production by phytoplankton. C) the largest numbers and diversity of organisms. D) clear water with low nutrient levels. E) low oxygen concentrations in the summer.

Biology & Microbiology