The nervous system develops primarily from
a. ectoderm.
b. mesoderm.
c. endoderm.
d. the placenta.
e. the gray crescent.
A
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Four of the following statements are typically true of placoderms. Which one is the exception?
a. They gave birth to live young. b. They had jaws. c. They had teeth.
d. They had paired pelvic fins. e. They had paired pectoral fins.
The cerebral hemispheres communicate with each
other by means of the a. cerebral cortex. b. corpora cardiaca. c. corporothalamus. d. corpus callosum. e. centrosome.
Assume that two genes are 80 map units apart on chromosome II of Drosophila and that a cross is made between a doubly heterozygous female and a homozygous recessive male
What percent recombination would be expected in the offspring of this type of cross?
Which of the following statements about digestion is true?
A) Digestion occurs only in the stomach. B) Digestion can be both mechanical and chemical, and it occurs both in the mouth and in the stomach. C) Mechanical digestion occurs only in the stomach; chemical digestion occurs only in the mouth. D) Digestion is the same thing as ingestion.