Duchenne muscular dystrophy and Becker's muscular dystrophy represent allelic forms of the same Xlinked
gene. Indicate whether the statement is true or false.
T
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Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then which of the following statements about species W
and Y are true? I) Species W and Y have genomes that are still similar enough for successful meiosis to occur in hybrid flies. II) Species W and Y have more genetic similarity with each other than either did with the other two species. III) Species W and Y may fuse into a single species if their hybrids remain fertile over the course of many generations. A) Only I is correct. B) Only II is correct. C) Only III is correct. D) I, II, and III are correct.
Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells. B. Radioactive substances have the potential to cause damage to living cells. C. Radioactive substances decay. D. Radioactive substances will perforate plasma membranes.
Testosterone is produced in the __________ under direct stimulation by __________
hormone.
a. testes; luteinizing b. pituitary; follicle-stimulating c. testes; follicle-stimulating d. pituitary; luteinizing
How many bases do deletion-insertion polymorphisms (DIPs) most frequently involve?
A) 1–2 B) multiples of 3 C) 10–100 D) more than 100