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BIO 448 MOLECULAR BIOLOGY OF DIFFERENTIATION

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(1)

BIO 448

MOLECULAR BIOLOGY OF

DIFFERENTIATION

(2)

Segmentation

• Distributes gene-regulating Substances.

• Morula

• Blastula

• Gastrula

(3)

The details of cleavage are different

between species.

(4)

Gastrulation Creates Three Tissue Layers

• Endoderm

• Ectoderm

• Mesoderm

(5)

Cellular Environment Affects the

Development Fate of Cells

(6)

Adult Structures Develop During Organogenesis Ectoderm, endoderm and mesoderm gradually

rearrange themselves to organs that are characteristic of animal species.

This process, called organogenesis, is normally performed by induction.

(7)

Sexual Maturation is Controlled by

Genes and the Environment

(8)

Aging is Programmed Genetically.

(9)

How Do People Develop?

• Human development is controlled by the same mechanisms that control the

development of other animals.

(10)

• Placenta secretes hormones and replaces materials between mother and embryo.

• Placenta only provides partial protection.

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