Why are skin grafts between identical twins more successful than grafts between more unrelated individuals?
a. Identical twins share the same uterine environment.
b. Identical twins are exactly matched in age
c. Identical twins have identical HLA alleles.
d. Identical twins are always the same sex.
e. Identical twins have the same blood type.
c
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The structure of a cell that contains the genetic information is called a ___________
A. nucleotide B. genetic code C. chromosome D. nucleic acids E. None of the answers are correct
When cancer cells have the ability to migrate to other parts of the body, they are said to be
A. invasive. B. benign. C. metastatic. D. oncogenic. E. genetic.
A small group of islanders leave "island A" and travel to "island B." After several generations on island B, a researcher finds that a large percentage of the population is left-handed. Left-handedness is a relatively rare trait on island A. A genetic event that explains this is
A) a population bottleneck. B) genetic load. C) a founder effect. D) natural selection.
What is an effect of SIV on infected
chimpanzees in the wild?
a. they are unaffected b. they leave fewer offspring c. they develop AIDS d. they become more fit e. more than one of these is an effect of SIV