Most causes of speciation are relatively slow, in that the differences separating species take many generations to accrue and establish reproductive isolation. Which of the following is most likely to produce a species in just a few generations?
a. Genetic drift
b. Behavioral isolation
c. Reinforcement
d. Founder effect
e. Polyploidy
Answer: e. Polyploidy
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You are preparing to administer the first of two units of packed RBCs. Evaluate each of the following statements about the safe administration of blood.
Answer T or F. Discuss why the false statements are incorrect. 1. Prime the correct tubing and filter with normal saline. 2. Verify K.L.'s identification with the secretary in the endoscopy suite. 3. Obtain baseline vital signs before starting the transfusion. 4. Begin the transfusion at a rate of 125ml per hour 5. Take K.L.'s vital signs 30 minutes after starting the transfusion. 6. Complete the transfusion within 6 hours of receiving the unit.
Congenital rubella syndrome usually occurs in the time frame of the
A. entire pregnancy. B. third trimester of pregnancy. C. second trimester of pregnancy. D. first trimester of pregnancy.
The burning of fossil fuels by cars and factories has most affected the ______________ cycle.
Fill in the blank(s) with the appropriate word(s).
Horizontal gene transfer is the transfer of genes between
A. cells within a multicellular organism. B. two chromosomes in a nucleus. C. organelles within a cell. D. different species, either prokaryotic or eukaryotic. E. one prokaryotic species to a different prokaryotic species.