Ch 3

Question 1

What is Evolutionary Development?

Answer 1

Contain “gene families” that have been identified that control development

• hox genes
• MADS genes

Question 2

Changes in developmental genes may result in what?

Answer 2

Large scale developmental changes

Question 3

What are the 4 types of large scale developmental changes

Answer 3

1. Heterochrony
2. Homeosis
3. Allometric Growth
4. Examption

Question 4

What is Heterochrony?

Answer 4

Change in development that leads to change in timing

-retaining juvenile characteristics (gills staying, no metamorphosis)

Question 5

What is Homeosis?

Answer 5

Change in spatial positioning within the organism

-forming a body part where something else should be

Question 6

What is Allometric Growth?

Answer 6

Change in the rate of growth within the organism

-one thing grown faster/slower than in other similar species

Question 7

What is Examption?

Answer 7

Process where variations in a trait become adaptive for a different purpose
-birds: formerly reptiles (scales into feathers)