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: 1094

#XL - Q Biochemistry

Not all intercellular signals require transduction. Which one of the following signals would be processed without transduction?

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#Question id: 2118

#XL - S Microbiology

Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? The animal cell is in:

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#Question id: 32941

#XL - S Microbiology

The extracellular matrix of a biofilm primarily consists of:

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#Question id: 4901

#XL - T Zoology

Assume that the alleles A (dominant) and a (recessive) show a maternal effect mode of inheritance. In a cross between an Aa female and an aa male, what would be the phenotypes of the progeny?

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#Question id: 7295

#XL - R Botany

If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering? (SS)