A student rescan, her decides to perform an experiment on the effect of the thyroid gland on frog metamorphosis. She sets up three aquaria with tadpoles. She adds thyroxine to the water of one, the drug thiouracil to a second, and nothing to the third. Thiouracil destroys thyroxine. Assuming that the student uses appropriate concentrations, predict what will happen.
To predict:
The things that might happen to three sets of tadpoles when the first set is grown in presence of thyroxine, the second set is grown in presence of thiouracil, and third is grown in normal water.
Introduction:
In the given scenario, a researcher wants to conduct an experiment on the effect of the thyroid gland in metamorphosis in the frog. For her experiment, she sets up three aquaria. In the first aquarium, she added thyroxine. In the second aquarium she added thiouracil and in the third nothing was added.
Explanation of Solution
The metamorphosis can be defined as the process through which the newborn animal physically develops into an adult by undergoing several changes. It is the feature of all the chordates and is induced by iodothyronine.
Thyroxine induces metamorphosis in the frog. In the aquarium in which thyroxine was added; the tadpoles will metamorphose into frog earlier than the normal tadpoles. Thiouracil destroys the thyroxine, thereby inhibiting the metamorphosis. So the tadpoles growing in the aquarium containing thiouracil will not show metamorphosis.
The thyroid gland of tadpoles produces a normal amount of thyroxine, which is sufficient to induce metamorphosis. So the tadpoles growing in the aquarium containing normal water will metamorphose at a normal rate.
The tadpoles growing in normal water will undergo metamorphosis at a normal rate, the tadpoles grown in presence of thyroxine will have metamorphosis earlier than normal. The tadpoles grown in presence of thiouracil will not undergo metamorphosis as it would be inhibited by thiouracil.
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