Transcript Life Cycles and Evolution of Developmental Patterns

Life Cycles and Evolution of
Developmental Patterns
Frog Development
 Overview of development
Frog Life Cycle
Gametogenesis and Fertilization
 What role do hormones play in these
processes?
– estrogen and vitellogenin
– progesterone and meiosis
 Seasonal effects
– females
– males
Cleavage
Cleavage
Gastrulation
Gastrulation
Organogenesis
Developmental Patterns
Unicellular Protists
 How were acetabularia used to illustrate the role of
the nucleus in development?
Developmental Patterns
Unicellular Protists
Developmental Patterns
Unicellular Protists
 Conjugation in paramecia
Developmental Patterns
Unicellular Protists
 sexual reproduction in chlamydomonas
Evolution of Multicellular Organisms
 beginnings of differentiation
Evolution of Multicellular Organisms
 simplest organisms with sperm and eggs
Evolution of Multicellular Organisms
 Life cycle of Dictyostelium
Evolution of Multicellular Organisms
 Life cycle of Dictyostelium
Evolution of Multicellular Organisms
 What causes the myxamoebae to aggregate?
Evolution of Multicellular Organisms
 What kinds of molecules promote cell adhesion in
dictyostelium?
Evolution of Multicellular Organisms
 What controls differentiation in dictyostelium?
Overview of Metazoan Development