What is the advantage of using DNA sequences from many genes to reconstruct the evolutionary history of humans?
What will be an ideal response?
ANS:
Each gene produces a tree that reflects the evolutionary history of that gene (a gene tree). If there were ancient polymorphisms that were maintained and lost differentially in descendent species, the gene tree may not reflect the species tree. Using DNA evidence from multiple genes more accurately reflects the species tree.
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If a cell had 12 chromosomes at the beginning of meiosis II, how many would each daughter cell have after the completion of meiosis II?
A. 24 B. 12 C. 6 D. 18
The ovarys_____ every month when releasing an egg.
A. Alternate B. release an egg C. none of these
In order to construct an evolutionary classification of modern-day aquatic vertebrates, what is the best source of information?
A) the DNA sequence B) the structure of organs C) the position of appendages D) the distribution of scales
The ________ is most commonly found in nature
A) recessive trait B) wild-type trait C) parental type D) dominant trait