Which of the following is involved in DNA replication?
a. RNA polymerase
b. ligase
c. promoter
d. terminator
b. ligase
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Thermophylic members of the phylum ________ can grow in geothermally heated water or soils that contain elemental sulfur.
Fill in the blank(s) with the appropriate word(s).
Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a _________ barrier that _______________.
A. prezygotic; causes geographic isolation B. prezygotic; causes temporal isolation C. prezygotic; prevents gamete fusion D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Refer to Figure 18-3. The average weight of a female guppy in the experimental group was:a
70 g.
b. 80 mg.
c. 170 mg.
d. 180 g.
e. 190 mg.
Discuss how genetic variability is maintained through genetic polymorphism. What will be an ideal response?