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: 11644

#7. System Physiology – Animal

Seven days after ovulation, pituitary secretion of luteinizing hormone (LH) decreases rapidly. What is the cause of this decrease in secretion?

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#Question id: 5563

#5. Developmental Biology

In mammalian eggs, the receptors for sperm are found in the ________.

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#Question id: 15772

#5. Developmental Biology

A stem cell capable of producing all the cell types of a lineage is said to be

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#Question id: 4949

#11. Evolution and Behavior

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

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#Question id: 10335

#6. System Physiology – Plant

plants can store high levels of nitrate, and they can translocate it from tissue to tissue without deleterious effect. Yet if livestock or humans consume plant material that is high in nitrate, they may suffer with,