A 2-year-old boy bruises easily and has previously had bleeding gums. The maternal grandfather has a bleeding disorder. His physical examination shows several small bruises on the legs. Of which coagulation factor would you suspect this patient to be deficient?

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#Question id: 5560

#5. Developmental Biology

In a newly fertilized egg, the vitelline layer ________.

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#Question id: 5561

#5. Developmental Biology

In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are ________.

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#Question id: 5562

#5. Developmental Biology

In an egg cell treated with a chemical that binds calcium and magnesium ions, the ________.

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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: 5564

#5. Developmental Biology

At the moment of sperm penetration, human eggs ________.

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#Question id: 5687

#8. Inheritance Biology

The error in meiosis that produces a 47,XYY karyotype is best  described by