Males who tend to be taller than average may have a chromosomal composition of
a. XXY.
b. XYY.
c. Turner syndrome.
d. Down syndrome.
e. XXX.
B
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What is the genetic consequence of a homozygous translocation?
A) Inviable gamete formation (semisterility) B) Gene duplications and deletions C) Formation of abnormal chromatids following crossing-over D) Abnormal pairing during meiosis E) An alteration in the linkage relationships of genes
A feature unique to mammals includes ________
A) the presence of hair B) extended parental care of the young C) being endotherms D) having no egg-laying members
Answer the following questions in reference to the four geologic periods listed below.
A. Asteroid impact at the K-T boundary caused extinctions. B. Human practices are the major agents of extinction. C. D. Volcanic activity in what is now Siberia released a large amount of carbon into the atmosphere causing extinctions. E. Oceans became anoxic, and methane burned on land. F. The greatest mass extinction event where 90 to 95 percent of all species were lost
Which part of the human eye detects colored light?
A) rhodopsin molecules B) cornea C) enzymes in ganglion cells D) aqueous humor E) cones