Which form of speciation is most rapid?
A. Sympatric speciation via polyploidy
B. Allopatric speciation on island archipelagos
C. Allopatric speciation on the mainland
D. Sympatric speciation via disruptive selection
E. Sympatric speciation via character displacement
Answer: A
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Premeiotic germ cells that divide mitotically in females are
A) primary oocytes. B) secondary oocytes. C) ootids. D) oogonia. E) ova.
Which physical feature makes it possible for amniotes to be completely terrestrial?
a. their skin b. their lungs c. their eggs d. their four limbs e. their brains
Receptors for both leptin and insulin (peptide hormones) are located in many parts of the nervous system, but most are in the hypothalamus, particularly in the _______________.
Fill in the blank(s) with the appropriate word(s).
If 20% of nucleotides in the DNA of a particular organism contain thymine, estimate the percentage of cytosine that is present in the DNA.
A. 80% B. 30% C. 20% D. 40% E. 15%