Bio Terms to Know (For Exam 3)

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13 Terms

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Amnion

Surrounds embryo in protective fluid

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Chorion

Participates in gas exchange

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Allantois

Contributes to waste storage and gas exchange

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Trophoblast

Helps with implantation and embryo support

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Inner cell mass

Gives rise to the embryo

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Ectoderm

  • role for nervous system

  • outer layer


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Mesoderm

  • muscles

  • middle embryonic germ layer


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Endoderm

  • digestive tract lining

  • Inner layer


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AER (apical ectodermal ridge)

limb outgrowth along proximal-distal axis


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ZPA (zone of polarizing activity)

limb patterning along front-to-back axis

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Hox genes

positional information along the body axis

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Monozygotic

one fertilized egg

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Dizygotic

two separate eggs