Ch. 1.1

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Last updated 8:55 PM on 9/14/26
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6 Terms

1
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Zygote

Single, fertilized egg cell


2
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Embryo

Time between fertilization and birth

3
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Oviparity

Animals born from eggs (e.g. birds, frogs, and most invertebrates)

4
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Viviparity

Animals born from live birth (placental mammals (e.g. capybaras) = nourished in and born from the mother’s body)

5
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Ovoviviparity

Animals born from eggs held within the mother’s body (e.g. reptiles, sharks, etc.)

6
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Model System

  • Size

  • Generation time

  • Embryo accessibility

  • Organism type and phylogenetic position

  • Ease of experimental manipulation and availability of data