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ZOO 3603C - EXAM 3 PRACTICE QUESTIONS AND CORRECT ANSWERS. VERIFIED 2025/2026.

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ZOO 3603C - EXAM 3 PRACTICE QUESTIONS AND CORRECT ANSWERS. VERIFIED 2025/2026.

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ZOO 3603C - EXAM 3 PRACTICE
QUESTIONS AND CORRECT ANSWERS.
VERIFIED 2025/2026.




Limb Dev I: Name the parts of the limb - ANS Stylopod: humerus, femur

Zeugopod: ulna + radius, tibia + fibula

Autopod: wrist + fingers, ankle + toes



Limb Dev I: what tissue does the limb bud emerge from? - ANS the flank lateral plate
mesoderm

(upper LPM)



Limb Dev I: what does the somite position of the limb bud determine? - ANS neck length



Limb Dev I: where does the limb bud appear in every animal? - ANS at the same Hox position

border of c5 and c6



Limb Dev I: what is the limb bud composed of? - ANS epithelium covering

two types of mesenchymal cells




1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.

, Limb Dev I: what are the two types of mesenchymal cells that the limb bud is composed of? -
ANS Lateral plate mesenchyme

somitic cells



Limb Dev I: what do the somitic cells make in the limb bud? - ANS myoblasts of the limbs,
muscle fibers

NOT connective tissues



Limb Dev I: what happens in the limb bud/adult limb if you remove somite? - ANS no muscle
or muscle fibers



Limb Dev I: what is the gene that shows evidence for somitic migration into the limb bud? -
ANS Pax 3



Limb Dev I: what is the receptor for Pax 3? - ANS c-met



Limb Dev I: what is the ligand for c-met? - ANS HGF

expressed in distal limb bud



Limb Dev I: what are splotch mice? - ANS they have no limb muscles, because no migration of
somitic cells into the limb because no Pax3



Limb Dev I: what is the role of Lbx in the limb bud? - ANS involved in production of extensors
and flexors. Without Lbx, extensors and flexors are reduced



Limb Dev I: what sculpts the limb? - ANS cell death




2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.

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