The embryo is recognizable as human and is called a

fetus at the end of which week of pregnancy?
a. ninth
b. twelfth
c. sixteenth
d. twentieth
e. twenty-fourth


Answer: a

Biology & Microbiology

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Which of the following is least likely to be the result of a mutation in the promoter of a gene?

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Allelopathy is

A. an obligate mutualism between a plant and its pollinator. B. an example of asymmetric competition between plant species. C. the transmission of viruses from ticks to their primary hosts. D. the movement of genes from one species to another.

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Cladograms allow for paraphyletic and polyphyletic groupings

Indicate whether the statement is true or false.

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Evolution must include a change in

A. The recessive phenotype B. The percentage of individuals in a population with the dominant phenotype C. The gene pool of a population D. The genes of an individual E. The dominant phenotype

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