Artificial Chromosome Doubling Can Be Induced by Means of Chemicals

question 110

Multiple Choice

Artificial chromosome doubling can be induced by means of chemicals that prevent the spindle from forming or functioning normally. A certain species of grass has seven pairs of chromosomes. How many chromosomes are present after one round of artificial chromosome doubling? After two rounds of chromosome doubling?

• A)14; 21
• B)14; 28
• C)21; 28
• D)28; 42
• E)28; 56

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Definitions:

Behavioral Contrast

A phenomenon in which a change in the reinforcement conditions of one behavior leads to an opposite change in the rate of another behavior.

Opponent Process

A theory suggesting that emotions are regulated by mechanisms that operate in opposing pairs.

Behavioral Contrast

The phenomenon where the rate of responding to one stimulus changes as a result of a change in reinforcement provided for responding to another stimulus.

Habituation

The process by which an organism decreases or ceases its responses to a repetitive stimulus over time, indicating a basic form of learning.