Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

In frogs, a lack of _______ prevents metamorphosis. In humans, a Jack of the same hormone during development results in ________.

  1. a. glucagon/ diabetes
  2. b. thyroid hormone/ cretinism
  3. c. growth hormone/ acromegaly
  4. d. testosterone/ androgen insensitivity syndorome

Summary Introduction

Introduction: Thyroid hormone is a hormone produced by the thyroid glands. Thyroid hormones are important for maintaining the metabolic rate of cells. It has major developmental effects in both humans and frogs.


Reason for the correct answer:

Thyroid hormone plays an important role in metamorphosis process found in frogs. It helps the tadpole to develop into frogs. The thyroid hormones initiate morphological changes in frogs during metamorphosis. Same hormones play important role in humans by controlling and regulating the metabolic rate of the body. Maternal thyroid hormones are essential during the fetal development stage. Maternal hypothyroidism leads to cretinism in the fetus.

Option b. is given as “thyroid hormone/cretinism.”

Hence, option b. is correct.

Reasons for the incorrect answers:

Option a. is given as “glucagon/diabetes”. This is incorrect because glucagon is a hormone that increases the blood sugar level by breaking down the glycogen stored in the liver but it does not play role in frog metamorphosis. Lack of same hormone in humans causes a condition called hypoglycemia...

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