Genetic testing performed on cells of the placenta is called ____, while a similar procedure that uses cells derived from the amniotic fluid is called ____
a. placenta sampling; chorionic villus sampling
b. trophoblast testing; amniocentesis
c. trophoblast testing; chorionic villus sampling
d. chorionic villus sampling; amniocentesis
e. placenta sampling; amniocentesis
ANSWER: d. chorionic villus sampling; amniocentesis
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Watson and Crick based their conclusion that DNA is a double helix mainly on experimental results and measurements from
A) Chargaff, Wilkins, and Franklin. B) Avery, MacLeod, and McCarty. C) Hershey and Chase. D) Charles Darwin.
How did researchers explain the smaller size of sexual maturity for guppies in some Trinidad streams?
a. Some low-quality streams have small carrying capacities, which forces guppies to reach sexual maturity more quickly b. Smaller streams require that individual fish be smaller at sexual maturity. c. Smaller sexually mature guppies were those that had hybridized with killifish, another small fish found in Trinidad. d. When predators select larger fish, the smaller fish reaching sexual maturity will experience increased fitness.
When the bacteria Wolbachia infects the wasp Nasonia vitripennis, what happens?
A) The wasp dies immediately. B) Female wasps produce less offspring. C) Females wasps produce more offspring. D) Female wasps are unable to produce offspring.
Second-site mutations that compensate for the effects of another mutation are known as
a. frameshift mutations. b. suppressor mutations. c. transitions. d. transversions.