Each branch point or node of a phylogenetic tree represents:
A. an environmental pressure for evolution.
B. a mutational event that leads to two species.
C. common ancestor to two connected branches.
D. the beginning of a new domain.
E. the point when life started on earth.
C
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Which of the following will be observed when the baby boomers begin to receive social security benefits? a. The social security deficit will skyrocket
b. Increasing numbers of older Americans will strain the health care system. c. All of the choices. d. The benefits being distributed to these individuals will exceed what they paid into the system.
Stabilizing selection would be present if
A. gene frequencies do not change from one generation to the next. B. mutations constantly replace the genes lost from one generation to the next. C. there are no selecting agents. D. All of these are possible.
As am embryo develops, different sets of genes are regulated by
a. promoters and operators b. mRNA and lac repressors c. operons and operators d. transcription factors and repressors
Satellite DNA is often found in regions of
a. heterochromatin. b. simple sequence DNA. c. low crossing over frequency. d. euchromatin. e. high G-C content.