All things being equal, which of these is the most parsimonious explanation for the change in the number of Hox genes from the last common ancestor of insects and vertebrates to ancestral vertebrates, as shown in the table above?
A) The occurrence of seven independent duplications of individual Hox genes.
B) The occurrence of two distinct duplications of the entire seven-gene cluster, followed by the loss of one cluster.
C) The occurrence of a single duplication of the entire seven-gene cluster.
Answer: C) The occurrence of a single duplication of the entire seven-gene cluster.
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A. Measuring pH B. Measuring oxygen and nitrogen tension C. Measuring DNA amounts in the sample D. Measuring electron donors and receptors
The short structures indicated by “A” in the figure
illustrating a step in PCR are a. template DNAs. b DNA polymerases. c. primers. d. RFLPs. e. restriction enzymes.
PCR joins many small DNA molecules into a long chain
Indicate whether the statement is true or false
DNA replication occurs without errors due to the complementary base pairing used in the copying process
Indicate whether the statement is true or false