Why is it that two different plasmids may be considered incompatible?
What will be an ideal response?
Ans: Two different single-copy plasmids may be incompatible if they share a common system for controlling the number of replications or the number of partitioned plasmids. Such systems can recognize that one plasmid has already been replicated (or partitioned), fail to recognize the second plasmid as different, and fail to replicate (or partition) it.
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To what does the term “ locus” refer?
a. A genetically defined location on a genetic map. b. Genes that are only located on the Y-chromosome. c. An area of sequence ambiguity near the centromeres of chromosomes. d. The position of a gene that currently has no known phenotype.
A woman has discovered she is pregnant. What should she avoid to reduce the risk of injuring the
fetus or having a miscarriage? What will be an ideal response?
If 15 percent of the nitrogenous bases in a sample of DNA from a particular organism is thymine, what percentage should be cytosine?
A) 30 percent B) 35 percent C) 70 percent D) 15 percent E) 40 percent
Which of the following is ultimately responsible for introducing new alleles into a population?
A) mutation B) natural selection C) genetic drift D) sexual selection