Reproductive isolation
A. is maintained by certain prezygotic and postzygotic barriers.
B. is necessary for species to remain separate.
C. means there is no gene flow between two groups of organisms.
D. All of the choices are correct.
E. None of the choices are correct.
Answer: D
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Urine via percutaneous aspiration is:
a. acceptable. b. not acceptable.
In humans free earlobes are dominant over attached earlobes. What are the possible genotypes of the offspring from a cross between parents that are Ee and ee.
a) EE, Ee, ee b) Ee c) Ee, ee d) free earlobes and attached earlobes e) attached earlobes only
The nucleus is surrounded by a membrane. This membrane has pores that enable the nucleus to carry out one of its functions. What do these pores allow to happen?
A) nutrients that are stored in the nucleus to enter the cytoplasm B) genetic information to pass from the nucleus to the cytoplasm C) waste substances to enter the nucleus D) proteins that are made in the nucleus to pass into the cytoplasm
A group of 3 bases in mRNA is a ___
Fill in the blank(s) with the appropriate word(s).