Where must fertilization by organisms that have external fertilization occur?
Chapter 17. Development and Aging Fertilization. [Figure...
Transcript of Chapter 17. Development and Aging Fertilization. [Figure...
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Chapter 17. Development and Aging
Fertilization. [Figure 17.1]
Extraembryonic membranes – Origins in reptiles.
Chorion.
Amnion.
The amniotic fluid.
Yolk sac.
Allantois.
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The extraembryonic membranes in human be-ings. [Figure 17.2]
The placenta:
Early embryonic development:Zygote6 Cleavage (1 cleavage 30 hours)6 Morula (3 days)6 Embryo6 Implantationst
(day 7)6 Fetus (beginning of 9th week)
Morphogenesis.
Differentiation.
Early development. [Figure 17.3]
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The formationof the embryo.[Figure 17.4]
The origin of tissues and theembryonic germ layers. [Figure17.5]
Ectoderm
Endoderm
Mesoderm
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Fetal circulation. [Figure 17.7]
Internal development of the male and female reproductive systems. [Figure 17. 9]
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Abnormal development of genitals.Example: Testosterone insensitivity syndrome.
The birth process. [Figure 17. 11]
Theories of aging:It may be genetic.
It may be a whole-body process.
Extrinsic factors play a part.
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