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.
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.
