Which of the following reproductive barriers actually prevents individuals of different species from mating with each other?

a. gametic isolation
b. behavioral isolation
c. hybrid sterility
d. hybrid breakdown
e. hybrid inviability


Ans: b. behavioral isolation

Biology & Microbiology

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Approximately one-third of a polypeptide chain consists of reverse turns because:

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The production of cyclic AMP in Dictyostelium results in

a. sexual reproduction. b. cell division. c. swimming. d. spore production. e. aggregation of cells.

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If the number of chromosomes in an animal's gametes is 20, then a somatic cell from that animal

would contain ____ chromosomes.

a. 5 b. 10 c. 20 d. 40 e. 80

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A cherry blossom has all four sets of modified leaves (sepals, petals, stamens, and carpels), so it is called a

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

Biology & Microbiology