How do lampreys differ from modern jawed fishes? What will be an ideal response?
ANSWER: Lampreys are very different from modern jawed fishes. They lack jaws, scales and paired
fins. In addition, their skeleton is made of cartilage. They are in many ways ‘living fossils' of
the ancient jawless fishes.
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The observation that island D. yakuba are more closely related to mainland D. yakuba than island D. yakuba are to D. santomea is best explained by proposing that D. santomea _____
A) descended from a now-extinct, non-African fruit fly B) arrived on the island before D. yakuba C) descended from a single colony of D. yakuba, which had been introduced from elsewhere, with no subsequent colonization events D) descended from an original colony of D. yakuba, of which there are no surviving members. The current island D. yakuba represent a second colonization event from elsewhere.
The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called
A. Mendelian inheritance. B. epistasis. C. genomic imprinting. D. linkage. E. dominance.
How many layers does the plasma membrane have?
a. One b. Two c. Three d. Four
Amphibians, birds, and mammals look the most similar as ______.
A. newborns B. embryos C. adults D. fossils E. juveniles