Four of the five answers listed below are conditions caused by chromosomal nondisjunction. Select the

exception.
a. Down syndrome
b. Huntington's disorder
c. Turner syndrome
d. Klinefelter syndrome
e. trisomy 21


B

Biology & Microbiology

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What type of neuron is responsible for carrying electrical signals AWAY from the CNS to elicit a response in the body?

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A keystone species

a. has a disproportionately large effect on a community relative to its abundance. b. controls the prey species. c. may increase or decrease the number of prey species in a community. d. has a disproportionately large effect on a community relative to its abundance and may increase or decrease the number of prey species in a community. e. has a disproportionately large effect on a community relative to its abundance, controls the prey species, and may increase or decrease the number of prey species in a community

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Which fish were thought to be extinct, but were actually found in living populations?

A. Acanthodii B. Acanthostega C. Placodermi D. Coelacanth E. Ostracoderms

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Recent discoveries of microscopic fossils have extended the known history of life to about:

A. 1 billion years ago. B. 2 billion years ago. C. 3.5 billion years ago. D. 4.5 billion years ago.

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