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5-10 Sexual Reproduction

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Fertilization in animals occurs when the male sperm joins with the female egg.  Sperm is produced in organs called testes.  Female eggs are produced in organs called ovaries.

Animal fertilization can occur either externally or internally.  Spawning is an example of external fertilization.  During spawning, male fish and female fish come very close together in the water.  The female release eggs into the water.  The male releases his sperm.  The sperm swim to the eggs and fertilize them.  Fertilization occurs outside the body.

Birds and also mammals reproduce by internal fertilization.  The female releases an egg from the ovary.  It travels down a tube that leads from the ovary.  When the male and female mate, the male releases sperm inside the female.  The sperm travels to the tube where the egg is and fertilizes it.  If fertilization does not occur, the egg leaves the female's body.

The fertilized egg is called a zygote.  The zygote begins to divide and grow and becomes an embryo.  In most mammals the embryo develops inside the mother's body in an organ called the uterus.  While in the uterus the developing embryo gets its food and water from the mother.  As the embryo grows it is called a fetus.  When the fetus has developed enough to live on its own, birth occurs.

EGG - ZYGOTE - EMBRYO - FETUS - NEWBORN

Directions: Answer the questions about reproduction in animals.

Fertilization in animals occurs when the male joins with the female .

When sperm and egg join outside the bodies of parents the process is called fertilization.

Spawning is an example of fertilization.

When sperm and egg join inside the body of the female the process is called fertilization.

Birds, cows and horses reproduce by fertilization.

The fertilized egg is called a .

An develops inside the mother's body in an organ called the uterus.

When a has developed enough to live on its own, birth occurs.

Put the stages of an embryo in the correct order.  Use the numbers 1, 2, 3, 4, 5.

embryo

fetus

newborn

egg

zygote

 

 

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EGG - ZYGOTE - EMBRYO - FETUS - NEWBORN