Biology 1st Edition by Jerome Krueger, Kendra Hill, Robert Noyd

تمرين 3

You have just adopted a basset hound puppy ( Fig. 1 ). Apply the following concepts-patterns of growth, germ layers, life stages, and life span-to the growth and development of this puppy by answering these questions:
a. List three areas of the puppy's body that are currently undergoing cell division.
b. Describe how the puppy's body shape changes as it develops into an adult. How do its head, eyes, ears, and legs change through time?
c. Refer to Figure 2 , what germ layer gives rise to the dog's muscles? Lungs?
d. Hounds are known for their great sense of smell. From what germ layer do these olfactory neurons arise?
Figure 1 Basset hound. (a) Puppy. (b) Adult.

Figure 2 Formation of tissues. During embryonic development, the germ layers give rise to different tissues in the body. This diagram shows examples of specific cells originating from each of the germ layers.