All EXCEPT which of the following events
shuffles existing alleles into different
combinations in sexually reproducing
organisms?
a. changes in chromosome number
b. mutation
c. independent assortment of chromosomes
d. crossing over
e. fertilization
B
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The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia. This is probably an example of _____
A. gene flow. B. sexual selection. C. directional selection. D. founder effect. E. disruptive selection.
Which of the following statements is true regarding mitochondrial and chloroplast genomes?
A) They contain mostly interspersed and tandemly repeated DNA. B) They are able to replicate independently of the nuclear DNA. C) They contain all the genes necessary for aerobic respiration. D) They are degenerate bacterial genomes that don't contain important protein-coding genes. E) They only encode for ribosomal and transfer RNAs.
You and your lab partner are observing a cell under a microscope, but you do not know whether it is a eukaryote or a prokaryote. Which of the following observations regarding the chromosomes would you use to immediately conclude that the cell is a
eukaryote? A) The chromosomes are circular in structure. B) The chromosomes are housed in a membrane-enclosed nucleus. C) The chromosomes contain very few proteins. D) The chromosomes are very simple in structure.
What is an advantage of cDNA libraries over genomic libraries?
A. cDNA only contains protein coding exons. B. cDNA libraries are more stable than genomic libraries. C. cDNA libraries are cheaper to make than genomic libraries. D. cDNA libraries require fewer steps to make than genomic libraries. E. cDNA lacks exons.