The graph above shows the survival of sociable weavers as a function of body mass. Sociable weaver body mass

seems to be an example of ____.
a. directional selection


b. stabilizing selection
c. sexual selection
d. disruptive selection
e. artificial selection


ANSWER: b

Biology & Microbiology

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True or false? _____ Mutations always result in negative effects on the organism. _____ Mutations are always large-scale (e.g., involving at least 10,000 base pairs of DNA)

DNA). _____ Mutations are never large-scale (e.g., involving at least 10,000 base pairs of DNA). _____ Most mutations are caused by an environmental pollutant. _____ Mutation rates are constant in all organisms. _____ Mutation rates are higher in men than in women because men have higher metabolic rates than women. _____ Mutation occurs every time a cell divides. _____ All mutations provide genetic variation on which evolution may act. What will be an ideal response?

Biology & Microbiology

The ion, _____, causes proteins associated with actin to move out of the way allowing _____

to bind to binding sites on _____.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Shortly after fertilization, successive cell divisions convert the zygote into a multicellular embryo during a process

known as ____.

a. meiosis b. parthenogenesis c. gastrulation d. cleavage e. blastulation

Biology & Microbiology

When water freezes, stable hydrogen bonds form between the water molecules that create an open, six-sided (hexagonal) arrangement

Indicate whether the statement is true or false

Biology & Microbiology