Evolution that involves changes in allele frequencies over just a few successive generations is referred to as:
a. natural selection.
b. microevolution.
c. macroevolution.
d. stabilizing selection.
e. directional selection
b
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Mitochondrial disorders are probably very rare because
A) people have many mitochondria, so the healthy ones can substitute for the affected ones. B) the oocytes with harmful mitochondrial mutations do not have sufficient energy to survive. C) they are difficult to diagnose because most physicians have forgotten what mitochondria are. D) they are not inherited from the father.
If you see a male calico cat, you can be fairly certain that his diploid cells have a sex chromosome combination of
____.
a. XYY b. XY c. XX d. XXY e. XO
In Down syndrome,
a. as the age of the mother increases, the chance of the defect occurring in the unborn children increases. b. the age of the father usually has an equal influence on the defect. c. most embryos abort before complete term. d. a person with the defect cannot have a normal child. e. 80% of trisomic 21 babies are born to women over the age of 40.
Which organelle can be likened to a post office?
A. Golgi apparatus B. nucleus C. mitochondria D. endoplasmic reticulum E. nucleolus