Human Growth and Development Zygote When a sperm

Zygote When a sperm carrying ______ the necessary DNA combines with an egg containing

Blastocyst • In a few days a ball consisting of an inner group of

Embyro • The cells begin to differentiate (take on specific ______ – types of

Embryo 1 st week Embryo has moved from the fallopian tubes to the _____

Embryo First 3 to 5 weeks The heart, brain and spinal cord have already

After about 8 weeks the embryo is considered a fetus Most of the organs

10 to 32 weeks Eyes aren’t complete until about 24 weeks.

Were you paying attention? • What is a fertilized egg called? ________ • In

• What two things connect the fetus and the mother providing food, water,

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Human Growth and Development

Zygote When a sperm carrying ______ the necessary DNA combines with an egg containing _____ the necessary DNA combine a zygote forms. A zygote contains ____ of the genetic information (DNA) necessary to become a child. The zygote undergoes _______ until a ball of cells is formed.

Blastocyst • In a few days a ball consisting of an inner group of cells and an outer shell is formed. This ball is called a blastocyst. • The inner cells will become the ______. The outer shell will become the membranes that nourish and protect the fetus.

Embyro • The cells begin to differentiate (take on specific ______ – types of cells that make up a human being) some form blood cells, others form nerve, bone, etc. • These first few weeks are when a developing child is most at _______ from what the mother takes into her system.

Embryo 1 st week Embryo has moved from the fallopian tubes to the _____ where it attaches to the uterine wall. The ____ and umbilical cord will grow and connect the fetus to the ____. This will be the fetus’s only source of food, water, and oxygen.

Embryo First 3 to 5 weeks The heart, brain and spinal cord have already begun to develop.

After about 8 weeks the embryo is considered a fetus Most of the organs and main body parts have begun to develop and can be clearly seen here.

10 to 32 weeks Eyes aren’t complete until about 24 weeks.

Were you paying attention? • What is a fertilized egg called? ________ • In a ________ the inner cells become the ______ the outer layer of cells become the membranes (placenta/amniotic sack) that nourish and protect the fetus. • At how many weeks is the embryo considered a fetus? _____ • Where are eggs usually fertilized? __________

• What two things connect the fetus and the mother providing food, water, and oxygen to the fetus? ________ • This is a thin but tough bag that surrounds the fetus protecting it and holding in the fluid that surrounds the fetus. ________ • When do the eyes finish forming? ______