Embryo Dice Questions

1
Embryo Dice Questions
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What similarities do the drawings have?

• Similarities include similar eyes, tails and
  visible spinal cords.
• Notice that each embryo develops a tail, buds
  that become limbs and pharyngeal pouches (which
  house the gills of fish and amphibians).

3
What are the differences?

• Differences should include the size and shape of
  the embryos.

4
What trends do you see as you go from stage to
stage?

• Although vertebrate bones are homologous, limbs
  develop differently in each group.
• The tail remains in most adult vertebrates.
• Although the coccyx (tail bone) serves as a point
  of attachment for certain muscles, this small
  internal tail does not resemble the long external
  tail of most other vertebrates.
• In humans the tail and pharyngeal pouches are
  relics (forms from the past) that disappear
  before birth.

5
Which Stage 3 embryos were easiest to match to
the correct animal?

• Opinions will vary but often times it is
• the fish because of the body shape
• the pig because of the snout
• the chicken because of the beak

6
Which stage of embryos (Stage 1,2 or 3) were the
most difficult to match to the correct animal?

• Most often it is the Stage 1 embryos that are the
  most difficult to match to the correct animal.
  There are a lot of similarities at this stage and
  the distinguishing features have not developed
  yet.

7
How does looking at the embryos help you to see
if there are relationships among organisms that
are not evident in the fully formed anatomy?

• There are similarities in the stage 1 (like the
  curly tails, the gills, or the vertebraes) that
  are evident early on but are not seen in the
  actual animal.

8
Order of Embryos from earliest to latest in
development.

• Fish 8,1,14
• Chicken 2,7,9
• Human 4,11,5
• Calf 10,15,12
• Pig 3,6,13