Crossing-over is
A) the place on a homologous pair of chromosomes at which a physical exchange occurs.
B) an extremely rare event.
C) an event that only takes place during meiosis.
D) the reciprocal exchange of homologous regions of chromatids.
E) not useful in mapping genes.
D
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Which disease may produce a malformed embryo if the mother develops the disease early in
pregnancy? a. rubella (German measles) b. chicken pox c. red measles d. hepatitis e. mumps
Which blood type is the universal recipient?
a. A b. B c. AB d. O e. none of these
Compare and contrast the digestive process in animals with two-way flow through their digestive system and those
that have a digestive system with one-way flow. What will be an ideal response?
Which substance, by providing strength, allows sclerenchyma cells to provide support and play a role analogous to that of an animal's skeleton?
A) lignin B) sucrose C) starch D) chlorophyll