Pre-lab QuestioSovvieofthe evolution o 1. Give a concise overview of the evoluti

Question

Pre-lab QuestioSovvieofthe evolution o 1. Give a concise overview of the evolution of the Frog (Origin, domestication, etc.) a. Include the Taxonomy 2. General information about the species a. Reproduction cycle (Gestation period, breeding season, etc.) b. Average lifespan c. Prominent Diseases d. Natural habitat e. Diet f. Usage in the scientific community 3. While preparing for the lab and doing the lab: 1. Think about the importance of the frog as a model organism 2. Take pictures and notes during the dissection to include in your lab notebook. 3. Note anything of interest that you learned while doing the dissection. Post lab Questions: 1. Explain the function of EVERY specialized organ or structure that is seen in the frog but not mammals. Compare and contrast any specialization of systems in frog to the human. 2.Any prominent physiology that differs from other species? Why/how is it useful?

Explanation / Answer

1. All frog species have a life cycle that starts with eggs laid in water, which hatch into aquatic tadpoles and then go through metamorphosis and become adult frogs. For decades it has been assumed that the typical mode (with eggs and tadpoles placed in water) gave rise to direct development through a series gradual intermediate steps involving eggs laid in various places outside water. However, species with eggs and tadpoles placed in water seem to give rise directly to species with direct development without going through the many seemingly intermediate steps that were previously thought to be necessary.

Frogs and toads tend to lay many many eggs because there are many hazards between fertilization and full grown frogness. Those eggs that die tend to turn white or opaque. Usually about 6-21 days after being fertilized, the egg will hatch. Most eggs are found in calm or static waters to prevent getting too rumbled about in infancy. After 7 to 10 days after the tadpole has hatched it will begin to swim around and feed on algae. After about 4 weeks, the gills start getting grown over by skin until they eventually disappear.

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