If a father is affected by an X-linked condition and the mother is a carrier, what is the probability of their children being affected?
a. All sons will be affected.
b. Half of the sons will be affected.
c. All daughters will be affected.
d. Half of the sons will be carriers.
b. Half of the sons will be affected.
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Synthetic thyroxine taken orally in the form of pills
is the recommended treatment for a. hypothyroidism. b. goiters. c. hyperthyroidism. d. Graves’ disorder. e. acromegaly.
Cordgrass (Spartina), glassworts (Salicornia), and spearscale (Atriplex) are types of plants commonly found in
A) bogs. B) salt marshes. C) mangroves. D) riparian forests.
Which of the following statements reflects a key concept about ecosystems?
a. Matter moves linearly through different systems, both abiotic and biotic, within an ecosystem. b. There is a one-way flow of energy through the food webs of ecosystems. c. Conservation should focus on the success and survival of individual species. d. The abiotic environment does not influence the distribution and survival of particular organisms. e. Heat energy can be used by organisms for their daily activities
Commercial logging by European countries in the Ivory Coast has reduced the pristine 70 million acres of forests that once existed to about
A) fewer than 1 million acres. B) 5-7 million acres. C) 15-20 million acres. D) 30 million acres. E) 50 million acres.