Gene regulation during development is _____, which means that _____
A. restrictive; genes are successively lost
over time
B. restrictive; genes lose developmental
potential over time
C. hierarchical; genes expressed at each
stage control the expression of genes that act
later
D. hierarchical; genes are turned on in a
specific sequence, starting with totipotent and
ending with multipotent
E. combinatorial; genes expressed at each
stage control the expression of genes that act
later
C
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Y-linked traits are sometimes passed from fathers to daughters following recombination between the sex chromosomes
A. true B. false
You cut a plasmid with a restriction enzyme that cuts it into three pieces — one fragment is 240 base pairs, one fragment is 600 base pairs, and one fragment is 1200 base pairs. You carry out electrophoresis of the digested sample. Which of the fragments will be closer to the top of the gel where the sample was inserted?
A. The 240 base pair fragment. B. The 600 base pair fragment. C. The 1200 base pair fragment. D. They will all be near the top because they all have sticky ends. E. It depends on the charge of the DNA fragment.
The goal of eugenics is to ____
a. select the most desirable human characteristics b. eliminate genetic disorders that reach a certain threshold in terms of their costs to individuals and society c. produce genetically identical humans. d. eliminate genes for abnormal behavior. e. produce genetically perfect people.
For what purpose is the polymerase chain reaction (PCR) used?
A) to analyze a person's fingerprints B) to separate fragments of DNA C) to make many copies of a small amount of DNA D) to cut DNA into many small pieces