What provides a pictorial summary of the evolution of various life forms on earth?
What will be an ideal response?
Phylogenetic tree
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Examine Figure 21.14. If you wanted to use a molecular clock to date a relatively recent divergence event—say, one that occurred in the last 100 million years or so—which of the four types of genes would make the best clock? Why?
A. Fibrinopeptides, because they have changed the most over that time period. B. A histone gene, because it has changed relatively little over that time. C. Fibrinopeptides, because they have changed relatively little over that time. D. A histone gene, because it has changed the most over that time period. E. Hemoglobin, because of its moderate rate of change.
Which of the following enzymes catalyzes the formation of a new 5' -3' strand of
A) helicase B) ligase C) single-stranded binding protein D) DNA polymerase
If the parents of a child have the following genotypes [Bb ´ Bb], what is the probability that they will have a child with the genotype [Bb]?
A. 100% B. 50% C. 25% D. 0%
Which of the following would be considered an environmental mutagen?
A) free radicals B) spontaneous events C) ultraviolet light D) the collision of water molecules with DNA E) DNA replication errors