In what way can defective transportable elements alter genomes even if they cannot mobilize? (Select all that apply.)
A) Crossing-over between transportable elements on the same chromosome can result in a deletion or an inversion.
B) Crossing-over between transportable elements on non homologous chromosomes can result in a reciprocal translocation.
C) Genes located between two transportable elements could be moved to a non homologous chromosome.
D) Proteins produced by the defective transposable elements introduce point mutations in other areas of the genome.
A) Crossing-over between transportable elements on the same chromosome can result in a deletion or an inversion.
B) Crossing-over between transportable elements on non homologous chromosomes can result in a reciprocal translocation.
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An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?
A) single, double, or triple B) single and double only C) single bonds only D) double bonds only
If the small groups of Viking explorers in Greenland and North America had survived and given rise to new populations, such a scenario would be an example of
A. genetic drift among the original Viking explorers. B. gene flow from continent to continent. C. the founder effect. D. the bottleneck effect. E. directional selection.
Which of these would be considered a cis-regulatory element for a gene?
A. Methylation of DNA preventing transcription B. A region of DNA sequence upstream of a gene where transcription factors bind C. A DNA binding protein that functions to repress transcription D. A protein that binds to an enhancer to activate gene expression E. a ribosome that translates a mRNA sequence to produce a transcription factor
A scanning electron microscope is used to study ________, whereas a transmission electron microscope is used to study ________
A) live cells; dead cells B) cell surfaces; internal cell structures C) dead cells; live cells D) internal cell structures; cell surfaces