A population of squirrels is preyed on by small hawks at maturity. The smaller adult squirrels can escape into burrows. The larger adult squirrels can fight off the hawks. After several generations, the squirrels in the area tend to be very small or very large. This is an example of __________.
a. disruptive selection
b. stabilizing selection
c. directional selection
d. balancing selection
e. Hardy-Weinberg equilibrium
Answer: a. disruptive selection
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Cells that are produced during mitosis have _____ of chromosomes and are referred to as ____.
a. one set; diploid b. two sets; diploid c. one set; haploid d. two sets; haploid
Which of the following is used to produce vaccines and antibiotics?
a. recombinant DNA technology b. gel electrophoresis c. genetic testing d. gene therapy
The cell walls of plant cells that have stopped
growing and actively dividing are characterized by the presence of a. pectin. b. cellulose. c. glue-like polysaccharides. d. lignin. e. a gluey matrix containing rope-like strands.
There are no mandatory screening programs for genetic defects such as PKU and galactosemia in
newborns Indicate whether the statement is true or false.