Question

Thyroid hormone (TH) has been identified as one of the factors promoting phenotype development in the Mexican axolotl salamander. Which of the following statements regarding the impact of TH is FALSE?

a. A genome-wide scan of both the axolotl and its sister species found a large reduction in the number of mRNA transcripts that regulate the production of TH.

b. Axolotls maturing in water with high concentration of TH (thyroxine; T4) metamorphose into a terrestrial form.

c. Most salamander species produce a burst of TH when they move from water to land.

d. Adding TH (thyroxine; T4) to the water in which axolotl individuals are reared causes them to remain in a larval stage.

Answer 1

Hi Answer:

Q. Thyroid hormone (TH) has been identified as one of the factors promoting phenotype development in the Mexican salamander, or axolotl. Which of the following statements regarding the impact of TH is FALSE?

Answer: Option D (Adding TH (thyroxine; T4) to the water in which axolotl individuals are reared causes them to remain in a larval stage.)

Addition of the TH into the water didn’t stop the metamorphosis of the salamander. If we add TH to water the larval stages will normally change into adult one, the presence of TH didn’t have any effect in the pause of metamorphosis.