In order to take up a naked DNA molecule, a cell must be ________, which may occur only at certain stages in the life cycle of the organism.
Fill in the blank(s) with the appropriate word(s).
competent
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Polyploidy is characterized by ____
a. the failure of homologous chromosomes to separate properly during meiosis b. a condition in which one chromosome is present in three copies c. a condition in which one member of a chromosomal pair is missing d. a chromosomal number that is not an exact multiple of the haploid set e. a chromosomal number that is a multiple of the normal haploid chromosomal set
Insect workers propagate more of their own alleles by helping their mother reproduce rather than by reproducing themselves; thus, they share a larger fraction of their ___________ with the next generation.
A. food resources B. time C. genome D. ability to defend their nest E. home
A needlestick is an example of what portal of entry?
A) Skin B) Parenteral route C) Mucous membranes D) All of these E) None of these
The population of American bison used to number in the millions of animals. Hunting and other problems greatly decreased the number of bison to about 1,000 animals. But today, the numbers are recovering to estimates of more than 200,000 animals. This crash in the population of bison and recent recovery is an example of ________.
A. the bottleneck effect B. gene flow C. genetic drift D. the founder effect