Pollen from one species germinates on the stigma of another related species and sexually fertilizes the ovule. Most of the resulting plants are sterile but some of the resulting offspring undergo chromosome duplication resulting fertile plants. The fertile offspring are known as

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#Question id: 9161

#Unit 9. Diversity of Life Forms

When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes ________.

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#Question id: 1278

#Unit 4. Cell Communication and Cell Signaling

Vertebrate gap junctions are composed of:

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#Question id: 11330

#Unit 10. Ecological Principles

Bio geographers have noted that the tropics have more terrestrial species than temperate regions. Which of the following is NOT a plausible explanation for this pattern?

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#Question id: 7697

#Unit 9. Diversity of Life Forms

The following question refers to the following phylogenetic trees. Which tree depicts the closest relationship between zygomycetes and chytrids?

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#Question id: 3713

#Unit 3. Fundamental Processes

At the normal rate of replication, about how many minutes does it take for the entire E. coli chromosome (4.6 × 10^3 kbp) to be duplicated?