X inactivation is controlled by
A) the SRY gene.
B) the XIST gene.
C) the XTASY gene.
D) the location of the spindle in mitosis.
B) the XIST gene.
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Among these contraception methods, the highest risk of accidental pregnancy accompanies _____
A) the use of a diaphragm B) the use of a condom C) the practice of coitus interruptus D) a verified vasectomy E) the practice of the "rhythm method"
Which of the following is NOT a risk factor for hypertension?
a. smoking b. obesity c. chronic stress d. a diet high in fruits, vegetables and dairy products e. excessive salt intake
Homologous chromosomes ________
A) carry genes controlling the same inherited characteristics B) include only the autosomes C) are a set of chromosomes that the cell received from one parent D) carry the same versions of all genes
The ___________________ propelled flowering plants to an explosive adaptive radiation.
a. colonization of the Galápagos Islands b. mass extinction of fern-like plants c. colonization of land d. evolutionary innovation of the flower e. evolutionary innovation of the leaf