Chapter 43
Biology: Life on Earth with Physiology · 9 exercises
Problem 1
Distinguish between direct and indirect development and give examples of each.
4 step solution
Problem 2
Describe the structure and function of the four extraembryonic membranes found in reptiles, including birds. Are these four present in placental mammals? In what ways are their roles similar in reptiles and mammals? How do they differ?
7 step solution
Problem 3
What is gastrulation? Describe gastrulation in amphibians.
7 step solution
Problem 4
Name two structures derived from each of the three embryonic tissue layers: endoderm, ectoderm, and mesoderm.
3 step solution
Problem 5
Describe induction.
6 step solution
Problem 6
What are homeobox genes? How do they regulate development?
3 step solution
Problem 7
How do hormones facilitate childbirth?
5 step solution
Problem 8
Why are smoking and consumption of alcohol discouraged during pregnancy?
4 step solution
Problem 9
How do changes in the breast prepare a mother to nurse her newborn? How do hormones influence these changes and stimulate milk production?
3 step solution