The first successful outcome of gene therapy was in a case of a young girl suffering from
____________________ who was supplied with copies of the ADR gene. Fill in the blank(s) with the appropriate word(s).
ANS: SCID
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External fertilization
A. occurs in amphibians. B. often leaves fertilized eggs susceptible to predation. C. involves the release of eggs and sperm into a body of water. D. requires specialized behavior. E. All of these statements are correct.
Scientists have studied atmospheric conditions over the last century and have noted that the
atmospheric carbon dioxide level has __________ and global temperatures have __________.
a. decreased; decreased b. decreased; increased c. increased; decreased d. increased; increased
Which hormone is made by neurosecretory cells in the hypothalamus?
a. antidiuretic hormone (ADH) b. thyroid-stimulating hormone (TSH) c. follicle-stimulating hormone (FSH) d. melatonin e. adrenocorticotropic hormone (ACTH)
The population of American bison used to number in the millions of animals. Hunting and other problems greatly decreased the number of bison to about 1,000 animals. But today, the numbers are recovering to estimates of more than 200,000 animals. This crash in the population of bison and recent recovery is an example of ________.
A. the bottleneck effect B. gene flow C. genetic drift D. the founder effect