All of the following are drawbacks associated with the DNA evidence of tracing African origins except:
a. scientists assume the DNA is originating in Africa and migrating out, but it could also be migrating into Africa.
b. mtDNA is not always passed from mother to child? sometimes, it skips a generation.
c. scientists assume that selective pressures do not affect the DNA, but there is
evidence for selective pressureon mtDNA.
d. both models suggest steady rates of mutation, and mutation is notoriously uneven.
e. mtDNA studies exclude information carried on the Y chromosome.
b
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When comparing a North American wolf and a whale, the fact that they both have a placenta would be considered a(n):
A. autapomorphic feature B. shared derived feature C. shared ancestral feature D. shared archetypical feature
All chordates possess at some point in their life cycle:
A. radial symmetry B. gill slits C. a diaphragm D. all of these
The notochord is:
A. an internal skeletal element B. a nerve chord C. an element of the circulatory system D. a musical instrument
What is the primary or major duty of the leader of the band?
What will be an ideal response?