1.2 A Frog's Life

Question 0

Haploid terms for frogs

Answer 0

1) female pronucleus

2) male pronucleus

Question 1

Hemispheres of the Egg

Answer 1

1) vegetal - where the yolk sac settles to provide food for the embryo (bottom portion of the egg)
2) animal - top portion of the egg

Question 2

Axes of the frog

Answer 2

1) anterior-posterior (head-tail)
2) dorsal-ventral (back-belly)
3) left-right

Question 3

Blastocoel

Answer 3

A fluid-filled cavity that forms in the animal hemisphere

Question 4

List the stages and within those stages list the steps of the typical frog life cycle.

Answer 4

1. Fertilization
2. Cleavage: Morula –> Blastula
3. Gastrulation: Blastula –> Neurula
4. Organogenesis: Notochord signaling of ectoderm to form the neural tube; mesoderm –> somites; birth/hatching
5. Larval stages: Metamorphosis starts from the tadpole’s thyroid)
6. Maturity
7. Gametogenesis: germ cell development begins; can take a long time.