Suppose you discover a mouse that has spiky fur instead of the usual soft fur. You notice that this trait seems to be present only in males. To investigate this pattern, you cross a spiky-fur male with a soft-fur female, and find that all the F1 progeny of both sexes have soft fur. You then interbreed the F1 and observe that all the F2 females have soft fur, but 1/4 of the F2 males have spiky fur. You conclude that the spiky allele is
A) an X-linked recessive.
B) Y-linked.
C) autosomal recessive with sex-influenced expression.
D) an X-linked dominant.
E) an autosomal dominant with sex-influenced expression.
C) autosomal recessive with sex-influenced expression.
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What was the minimal requirement to perform a "classic DNA fingerprinting" test in order to associate a blood sample with a criminal?
A. one sample of DNA, PCR amplification, restriction enzymes, and gel electrophoresis B. one sample of DNA, restriction enzymes, a DNA synthesizer, and gel electrophoresis C. two samples of DNA, PCR amplification, restriction enzymes, and gel electrophoresis D. two samples of DNA, PCR amplification, a DNA synthesizer, and gel electrophoresis
Most often, three tissue layers form: outer __________, inner __________, and __________ in
between the first two layers. Fill in the blank(s) with the appropriate word(s).
A hypothesis is:
a. a tentative explanation. b. a systematic thought process. c. an observation. d. a placebo. e. a conclusion.
Which of the following techniques has been used to clone sheep, cats, cows, and several other types of mammals?
A) DNA cloning B) Somatic cell nuclear transfer C) Therapeutic cloning D) Electroporation E) Gene knockout