A major difference between allopatric and sympatric speciation is whether
A. resulting species are reproductively isolated or not.
B. gene flow continues to occur or not.
C. two or three species result.
D. geographic isolation is required or not.
E. the new species are separated by a prezygotic or postzygotic isolating mechanism.
Answer: D. geographic isolation is required or not.
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You find an Arabidopsis plant in your greenhouse that lacks stamens and carpels, and has two rows of petals and sepals. What happened to cause this abnormal flower development?
A. a deleterious mutation of gene C B. an overexpression of gene B C. a deleterious mutation of gene A D. a deleterious mutation of C and overexpression of E E. a deleterious mutation of C and overexpression of A
An mRNA that contains the coding sequence for two or more structural genes is called a
A. polyintronic mRNA. B. polyextronic mRNA. C. polycistronic mRNA. D. polyexpressive mRNA. E. polyrepressor mRNA.
The DNA molecule of a eukaryotic chromosome has a single replication origin.
a. true b. false
Scientists have inserted the gene for human insulin into plasmids. The new plasmids are an exampmle of
A.) recombinant DNA B.) applied bioinformatics C.) therapeutic cloning D.) gene therapy