Crossing over
a. increases variability in gametes.
b. results in only one exchange per homologue.
c. occurs between sister chromatids.
d. prevents genetic recombination.
e. is followed immediately by separation of each of the chromatids.
A
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Sheree is referred to a genetic counselor because a cystic fibrosis (CF) test done as a routine part of her prenatal care indicated that she is a carrier of the most common mutant allele. Sheree is stunned, because no one in her family has the disease. She is 26 years old. The genetic counselor would most likely
A) explain autosomal recessive inheritance and suggest that Sheree's husband be tested for CF. B) explain autosomal dominant inheritance and suggest that Sheree's husband be tested for CF. C) explain autosomal recessive inheritance and suggest that Sheree's parents be tested for CF. D) advise Sheree to have amniocentesis to check the fetus for the CF genotype.
Which of the following is the proper sequence
for mitosis? I. metaphase II. telophase III. prophase IV. anaphase
a. II, I, IV, III b. I, II, III, IV c. III, I, IV, II d. IV, III, II, I e. I, IV, II, III
The process by which a cell takes in a small amount of extracellular fluid and its contents by the ballooning inward of
the plasma membrane is the definition of ____.
a. endocytosis b. exocytosis c. phagocytosis d. passive transport e. osmosis
The amphibian heart consists of two atria and two ventricle(s). Indicate whether the statement is true or false