Marfan syndrome can be caused by mutations in either of two genes involved in the disorder, but mutations in one of the genes blocks activity of the other. This means that Marfan syndrome demonstrates

A) variable expressivity and complete penetrance.

B) an acquired phenotype.

C) late onset and early onset.

D) genetic heterogeneity and epistasis.


D) genetic heterogeneity and epistasis.

Biology & Microbiology

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In the figure above, the honeycomb on which the bee is standing is made up primarily of ____

a. carbohydrates b. nucleotides c. proteins d. lipids e. amino acids

Biology & Microbiology

Which factor has NOT been implicated in breaking

dormancy? a. cytokinin movement from leaves to buds in late summer b. action of abscisic acid in the spring c. gibberellin accumulation in buds in late autumn and winter d. an exposure to low temperatures for hundreds of hours e. all of these

Biology & Microbiology

Stromatolites appeared about ____ years ago.

Biology & Microbiology

Which of the following cells rely exclusively on glycolysis to supply them with ATP?

(a) anaerobically growing yeast (b) aerobic bacteria (c) skeletal muscle cells (d) plant cells

Biology & Microbiology