Mutations in the selector genes sometimes form structures in the wrong segment, transforming the antenna of a fly into a leg, for example. What are such mutations called?
A) homologous mutations B) lethal mutations
C) homeotic mutations D) silent mutations
Answer: C
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A Class 4 hurricane is centered over Bermuda (latitude 32.20 N) and is moving eastwards. Which coastal city on the eastern coast of the United States is in the most peril from its approach?
a. Savannah, GA (latitude 32.08 N) b. Jacksonville, FL (latitude 30.32 N) c. Wilmington, NC (latitude 34.23 N) d. Boston, MA (latitude 42.36 N)
The molecule that rapidly replenishes ATP at the beginning of muscle activity is
A. actin. B. creatine phosphate. C. dystrophin. D. acetylcholine. E. myosin.
What gene is critical for establishment of X-inactivation in mammals?
What will be an ideal response?
The significance of totipotency is that:a
genes are not regularly lost during development. b. most organisms can be easily cloned. c. differentiation leads to the loss of certain genes in each cell. d. somatic cells are incapable of differentiation. e. unexpressed genes are lost during development.