One disease for which gene therapy has been attempted but has not yet been successful is
A. anthrax.
B. tuberculosis.
C. the common cold.
D. cystic fibrosis.
Answer: D
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Color blindness is a recessive X-linked trait. A normal couple has a color-blind child. Who else in this family is probably color blind?
A. the child's maternal grandfather B. the child's maternal grandmother C. the child's paternal grandfather D. the child's paternal grandmother E. the child's maternal grandmother or grandfather
A ____ mutation in snails can reverse the direction of shell coiling, which ____ mating
a. single; encourages b. single; prohibits c. double; encourages d. double; prohibits e. large deletion; encourages
What benefit do legumes derive from Rhizobium?
a. help make carbon dioxide more available b. increase root surface area c. nitrogen fixation d. protection e. retain water so it is more available to the plant
Movement of sister chromatids back and forth during prometaphase is known as ________
Fill in the blank with correct word.