Expression of homeotic genes
A) assigns a unique identity to each segment.
B) defines anterior and posterior ends of the fly.
C) controls the expression of the segment polarity genes.
D) subdivides the embryo into a precise number of segments.
A) assigns a unique identity to each segment.
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In humans, where is the tympanic membrane?
a. in the outer ear, adjacent to the pinna b. deep within the middle ear c. between the outer ear and the middle ear's cavity d. adjacent to the stapes e. between the middle ear and inner ear
Sharks differ from most other fish in that they lack ____
a. gill slits b. scales c. bone d. paired appendages e. teeth
In the context of good science, which of the following can cause a hypothesis to be changed or rejected?
A. new observations B. new data C. experiments D. All of the above.
Which term refers to the fusion of the cytoplasm of two genetically different cells?
a. karyogamy b. osmosis c. plasmogamy d. symbiosis