Science
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Fertilization. | The combining of an egg and sperm cell to produce a zygote.
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| Early cell divisions are known as _________________. | Cleavage.
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| True or False: During cleavage, the fertilized egg stays the same size and no growth occurs. | True.
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| An early stage of animal development in which the embryo consists of a solid ball of cells formed by cleavage of the fertilized egg. | Morula.
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| The ________ and __________ cell stage is known as the morula. | 16, 32.
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| A complex series of changes that occurs after fertilization and eventually give rise to an adult organism. | Development.
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| The stage of development in which the embryo consists of a single layer of cells surrounding a fluid filled cavity. | Blastula.
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| Blastulation. | The process of changing from a zygote to a blastula.
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| The fluid filled cavity in a blastula. | Blastocoel.
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| Gastrulation. | The process in which the cells on one side of a blastulla push into the form the two layered gasturla.
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| Gastrulation starts with the folding in of cells at a spot called the __________. | Blastopore.
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| During gastrulation, the cells migrate inward, or ______________. | Invaginate.
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| What does the ectoderm form? | Hair, nails, skin, nervous system, respiratory tract, liver, pancreas.
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| What does the endoderm form? | Digestive system.
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| What does the mesoderm form? | Muscles, skeleton, circulatory system.
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| The series of changes that transforms unspecialized cells into specialized tissues and organs. | Differentiation.
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| Embryo. | Organism in the early stages of development.
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| When can you label an embryo as a fetus? | When you can tell what type of organism it is.
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| Development that takes place outside of the body of the female. | External development.
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| Stored food in an animal egg, nutrition for the growing embryo. | Yolk.
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| Provides protection for the embryo, porous. | Shell.
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| Lines the shell and encloses the embryo. | Chorion.
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| Functions in the exchange of respiratory gases and excretion of wastes, uric acid. | Allantois.
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| Contains amniotic fluid, provides a watery environment for protection. | Amnion.
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| Surrounds the yolk and allows absorption of food into embryo blood vessels. | Yolk sac.
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| LABEL THE EMBRYO | :D
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| Female organ where the embryo develops. | Uterus.
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| A mass of blood vessels attached to the stomach of an embryo and the placenta of the mother where materials are carried between the two . | Umbilical cord.
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| Specialized organ where the embryo receives food and oxygen from the mother's body and gets rid of wastes, such as carbon dioxide. | Placenta.
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| How are materials exchanged between the mother and the baby? | Diffusion and active transport.
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| Where fertilization takes place. | Fallopian Tube/Oviduct.
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