When an allele can produce a range of phenotypes, its expression is said to be
a. clearly established.
b. variable.
c. codominant.
d. incompletely dominant.
e. incompletely penetrant.
B
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Most cnidarians are known to produce toxins. In fact, it has been claimed that one particular species produces the most deadly of all toxins on the planet. What feature of this group most likely evolved simultaneously with the evolution of these toxins?
A) the medusa body form B) asexual reproduction C) a slow-moving or sessile lifestyle in the adult D) diploblastic design E) bilateral symmetry in the mobile larval forms
How did the concept of biogeography shape Darwin's thinking?
What will be an ideal response?
In the three-domain system, the eukaryotes are represented
A) only within the domain Eukarya. B) only within the domain Archaea. C) only within the kingdom Protista. D) in all three domains.
Water molecules readily form hydrogen bonds with other polar molecules, and when they encounter nonpolar molecules they must form hydrogen-bonding networks with neighboring water molecules
Which of the following molecules will cause a "cage" of water to form? (a) 2-methylpropane (b) acetone (c) methanol (d) urea