Which of the following is not information derived from karyotypes?
A. The number of chromosomes in a genome.
B. The number and type of sex chromosomes.
C. The presence or absence of individual chromosomes.
D. Structural abnormalities.
E. The pattern of inheritance: recessive, dominant, etc.
E
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Molluscs that live in a tusk-like shell that is open at both ends belong to the class:
a. Polyplacophora. b. Scaphopoda. c. Cephalopoda. d. Gastropoda. e. Bivalvia.
How long ago did the first gymnosperms evolved?
A. 360 million years ago B. 360 thousand years ago C. 36 million years ago D. 36 thousand years ago
Of the following, which is the first explanation of a
problem? (a testable answer to the question) a. principle b. law c. theory d. fact e. hypothesis
Colchicine is a drug that:a
arrests cells in mitotic telophase. b. stimulates meiosis. c. prevents DNA replication. d. arrests cells in mitotic metaphase. e. prevents cells from entering prophase.