In the partially concordant phylogenies below that illustrate cospeciation events between dove hosts and their lice parasites, nodes labeled with lowercase letters indicate cospeciation events
How do you explain that cospeciation event h is located on an internal node?
What will be an ideal response?
ANS:
A common ancestor of a clade of lice cospeciated with the common ancestor of a corresponding clade of doves.
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Which event occurs during the luteal phase of the menstrual cycle?
a. The corpus luteum forms. b. A zona pellucida forms around the oocyte. c. An oocyte completes meiosis I. d. Estrogen levels increase. e. Testosterone levels increase.
Which of the following does not provide molecular evidence for evolution?
A) The 1,000-fold differences in nonsynonymous substitutions between some genes B) The existence of pseudogenes C) The fact that high-expression genes use amino acids that are less energetically costly than those used by low-expression genes D) The fact that there is a lower rate of nucleotide substitutions in coding regions than in noncoding regions of genes E) All these are molecular evidence for evolution
Which of the following crosses would always result in offspring that only display the dominant phenotype?
A. TT x tt B. Tt x Tt C. TT x TT D. Tt x tt E. Two of the crosses will always display the dominant phenotype
DNA microarrays reveal
A) if any genes are mutated in a given cell. B) if reverse transcriptase is present in a given cell. C) which genes are being expressed in a given cell. D) which genes are found in a given cell. E) if a particular gene was acquired via horizontal gene transfer.