The existence of three copies of chromosome 21 is characteristic of

a. Turner's syndrome.
b. Down syndrome. c. PKU.
d. Tay-Sachs disease.


ANSWER: b

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Hearing is normal when sounds can be heard at a minimum of ________ decibels

Fill in the blank(s) with correct word

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What is the final step of generalization?

A. Alter antecedents and required student responses B. Present examples at a quick pace C. Vary the reinforcement schedule and fade to natural consequences D. Provide an intertrial interval before the next real-world experience

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A teacher is advised to prepare instructional objectives, teach toward those objectives, and then assess student learning against those same objectives

Indicate whether this statement is true or false.

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What is the name of the letter ??

a. phi b. rho c. sigma d. alpha

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