In the late 1920s, a mutation occurred in many silver
fox farms around the world. The fox farms that sold
expensive furs were proud of the quality of their furs,
and each advertised that it had the best, purest breed
of all the fox farms. The new mutations produced a
“platinum” coat pattern that was commercially
desirable, so the farms crossed them to get more. The
results of their breeding experiments were as
follows: (1) silver x silver >>> all silver offspring;
(2) silver x platinum >>> equal numbers of silver
and platinum; (3) platinum x platinum >>> two
platinum for each silver offspring. Explain. What will be an ideal response?
Answer: PP (silver), Pp (platinum), pp (lethal)
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Which of the following enzymes unwinds the DNA helix during replication in E. coli?
A. primase B. DNA Pol I C. gyrase D. helicase E. SSB
Starting with a single piece of dsDNA, after 3 PCR cycles there are
A. 2 additional pieces of dsDNA. B. 4 additional pieces of dsDNA. C. 8 additional pieces of dsDNA. D. 16 additional pieces of dsDNA.
Caribbean seagrasses are extensively fed on by all except
a. manatees. b. green sea turtles. c. some sea urchins. d. sea cucumbers.
In human females, what does their urine passes through?
A. Clitoris B. Vagina C. Perineum D. Urethra