Which of the following is NOT true about hagfishes?
a. They are jawless chordates with some
resemblances to lancelets and some to
vertebrates.
b. They possess a partial cartilaginous cranium.
c. They are known only from the fossil record.
d. When threatened they secrete copious amounts
of mucus.
e. They lack jaws.
Answer: c
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A dihybrid cross of linked genes theoretically gives a phenotypic ratio of
A. 1:1. B. 9:3:3:1. C. 3:1. D. 1:1:1:1. E. 2:1.
A homing pigeon that uses landmarks to find its way back to its nest is exhibiting
A. solar navigation. B. piloting. C. true navigation. D. magnetic orientation. E. stellar navigation.
The difference between normal and sickle-cell
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