In tiger salamanders one phenotype is cannibalistic while another is not. Both are stable strategies. Which form of selection is best represented by this scenario?
A) stabilizing
B) directional
C) disruptive
D) proportional
C
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If a human female has 2 Barr bodies per cell, it is almost certain that
A. her father had 1 Barr body per cell. B. her mother also had 2 Barr bodies per cell. C. she developed from a fertilized egg with 3 X chromosomes. D. she is genetically a male with female characteristics. E. she is genetically a normal fertile female.
Identify the indicated blood vessel.
What will be an ideal response?
Tinbergen is credited with founding the field of behavioral ______, the study of how natural selection shapes behavior.
A. genetics B. ecology C. symptomatology D. demographics
Why is Chorionic villus sampling preferred over amniocentesis in some geographic regions?
a. Because it samples amniotic fluid and allows for a more accurate assay. b. Because the test is conducted earlier in the pregnancy, performed at 10-12 weeks. c. It is ofter conducted later in the pregnancy, at 15-20 weeks. d. Some workers report a lower success rate of correct karyotyping.