Red sea urchins and purple sea urchins occur in the same area and release their gametes at the same time into the ocean. The sperm and eggs often bump into each other but do not create hybrids because of incompatible proteins on their surfaces. This is an example of:
A) temporal isolation
B) habitat isolation
C) behavioral isolation
D) mechanical isolation
E) gametic isolation
Ans: E) gametic isolation
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The function of the secretory component of the IgA molecule is
A. to protect IgA from being destroyed by proteolytic enzymes. B. to coat the antigen. C. opsonization. D. to fix IgA to the antigen.
Assuming incomplete dominance, if a homozygous red-flowered plant is crossed with a homozygous white-flowered plant, what will be the color of the offspring?
A) Red B) White C) Pink D) Red and white
Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid
The frogs are identical in appearance, but their mating calls, which females use to find mates, differ. Which difference most likely evolved first? A) polyploidy B) difference in mating calls C) Polyploidy and different mating calls must have evolved at the same time.
what describes the liver's structure or function?
What will be an ideal response?