Ptosis (droopy eyelid) may be inherited as a dominant human trait. Among 30 people who are heterozygous for the ptosis allele, 10 have ptosis and 20 have normal eyelids. What is the penetrance for ptosis?

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#Question id: 9168

#9. Diversity of Life Forms

Which of the following statements best describes the interaction between fire and ecosystems?

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#Question id: 4581

#11. Evolution and Behavior

The Linnaeus classification system grouped organisms by ________.

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#Question id: 10736

#10. Ecological Principles

Ecotones are:

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#Question id: 10407

#6. System Physiology – Plant

Dark induce gene expression activated by___

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#Question id: 8718

#9. Diversity of Life Forms

Which of the following would, if it had acted upon a gene, prevent this gene from acting as a reliable molecular clock?