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: 14972

#XL - S Microbiology

Although O side chains are readily recognized by host antibodies, gram negative bacteria may thwart host defenses by 

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#Question id: 20150

#XL - P Chemistry

The number of electrons in the M shell of the clement with atomic number 24 is

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#Question id: 11330

#XL - T Zoology

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: 11941

#XL - T Zoology

Under conditions of normal renal function, which of the following is true of the concentration of urea in tubular fluid at the end of the proximal tubule?

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#Question id: 9612

#XL - R Botany

The best classification system is that which most closely