Download Name_____________________________________

Name_____________________________________
Living Environment
Date_____________
Period___________
Fertilization and Development
Fertilization:
A fertilized egg is called a ___________________________________________.
Fertilization takes place in the ______________________________________________________________________________.
1. Internal Fertilization:
2. Internal Development:
Twins:
3. Paternal (Identical Twins):
4. Fraternal (Non-Identical Twins):
Name_____________________________________
Living Environment
Date_____________
Period___________
Fertilization
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Occurs in the upper portion of the ________________________ (fallopian tube)
If the egg is not ________________________________ within 24-48 hours after ovulation, it will die and be
shed from the body during ______________________________________________.
________________________________ begins in the oviduct (fallopian tube).
About 6-10 days later, the _________________________ may be implanted in uterine lining as a
_________________________.
Embryonic Development
The zygote undergoes mitotic cell divisions called _____________________________________.
Once cleavage begins, the zygote becomes developing ____________________________________.
Cleavage:
Name_____________________________________
Living Environment
Gastrulation
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Date_____________
Period___________
Name_____________________________________
Living Environment
Date_____________
Period___________
Differentiation
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a series of changes that transforms unspecialized embryonic cells, tissues and organs that make up
an organism into specialized structures
The cells of the ectoderm, mesoderm and endoderm differentiate and develop into the various
tissues and organs of the body.
The three layers of the gastrula develop into: (refer to the diagram below)
Embryo:
Fetus:
Name_____________________________________
Living Environment
Date_____________
Period___________
The Mammalian Embryo
Internal fertilization and internal development = fertilization and development inside the body.
A proper balance of nutrients and gases are supplied to the embryo by the following structures:
1. Placenta:
2. Amnion(Amniotic Sac):
3. Umbilical Cord:
Name_____________________________________
Living Environment
Date_____________
Period___________
Gestation: The period of time between conception and birth (about 9 months for humans) 40 weeks.
Name_____________________________________
Living Environment
Label the diagram below:
Date_____________
Period___________
Name_____________________________________
Living Environment
Date_____________
Period___________
The Chick Embryo
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Internal fertilization and exrternal development =fertilization _________________________ and
development _______________________ the body.
Structures:
1. Chorion:
2. Amnion:
3. Allantois:
4. Yolk Sac:
5. Shell:
Name_____________________________________
Living Environment
Date_____________
Period___________
Reproductive Technology
In-Vitro Fertilization (IVF) - a complex series of procedures used to treat infertility or genetic problems
and assist with the conception of a child - during IVF, mature eggs are collected (retrieved) from female
ovaries and are fertilized by sperm in a lab
Cloning - the technique of producing a genetically identical duplicate of an organism by replacing the
nucleus of an unfertilized ovum with the nucleus of a body cell from the organism you want to clone