A reflex ____
a. only involves the use of sensory neurons
b. is an automatic response to a stimulus that requires considerable thought
c. is an automatic response to a stimulus that doesn't require thought
d. is an involuntary response that requires only one neuron
e. does not require the brain
ANSWER: c
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In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:
A) Genes sn and car are linked.
B) Genes sn and car are not linked.
C) Genes sn and car are located close together on the same chromosome.
D) Crossing-over sometimes occurs between sn and car.
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Indicate whether the statement is true or false
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What will be an ideal response?
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What will be an ideal response?