1. Developmental Biology An Introduction

2. Animal Development How has the study of development changed? How has the study of development changed?

3. Animal Development What kinds of questions are developmental biologists asking?

4. Animal Development How does the same genetic information result in different types of cells?

5. Animal Development How is cell division regulated? How is cell division regulated?

6. Animal Development How do cells form ordered structures? How do cells form ordered structures?

7. Animal Development How are reproductive cells set apart? How are reproductive cells set apart?

8. Animal Development How do changes in development create new body forms and what changes are possible?

9. Animal Development How do each of these contribute to the study of development? How do each of these contribute to the study of development? comparative embryology comparative embryology evolutionary embryology evolutionary embryology teratology teratology mathematical modeling mathematical modeling

10. Comparative Embryology Epigenesis versus preformation Epigenesis versus preformation

11. Comparative Embryology How does the concept of germ layers support epigenesis? How does the concept of germ layers support epigenesis? How does the concept of induction fit in here? How does the concept of induction fit in here?

12. Comparative Embryology What principles did What principles did von Baer articulate with respect to vertebrate development?

13. Comparative Embryology General features of large group of animals appear earlier than specialized features of smaller group General features of large group of animals appear earlier than specialized features of smaller group Less general characteristics develop from more general Less general characteristics develop from more general

14. Comparative Embryology A particular type of embryo, instead of passing through adult stages of a lower form, departs more and more from it. A particular type of embryo, instead of passing through adult stages of a lower form, departs more and more from it. Embryo of higher animal is only like early embryo of lower animal. Embryo of higher animal is only like early embryo of lower animal.

15. Comparative Embryology How have fate maps contributed to our understanding of development? How have fate maps contributed to our understanding of development?

16. Evolutionary Embryology How have observations of embryos contributed to our understanding of evolutionary relationships? How have observations of embryos contributed to our understanding of evolutionary relationships?

17. Evolutionary Embryology Why is the distinction between analogous and Why is the distinction between analogous and homologous structures important?

18. Teratology How are malformations different from disruptions?

19. Mathematical Modeling What’s the difference between isometric and allometric growth? What’s the difference between isometric and allometric growth?

20. Figure 1.20(1) Reaction-diffusion System of Pattern Generation

21. Figure 1.22 Pigment patterns of zebrafish homozygous for the wild-type allele (A) and for three different mutant alleles (B–D) of the leopard gene