Embryological Development In Vertebrates

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by jneub1990
Last updated 5 years ago

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Science
Subject:
Biology

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Embryological Development In Vertebrates

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Embryological Developmentin Vertebrates

http://www.pbs.org/wgbh/nova/evolution/guess-embryo.html

Common Core LS.3.8.9

What is a Vertebrate?A vertebrate is defined as "an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes."

So a vertebrate is any living thing that has a spine!

...Then what is an Embryo?An embryo is "an unborn or unhatched offspring in the process of development."Depending on the species, an embryo cangrow inside of the mother's body, or growinside of an egg!

Oh!

Did you know?Some fish give live birth, while some mammals lay eggs!

SimilaritiesAll vertebrate embryos begin as a fertilized egg (which will grow inside the body OR be laid by the mother into the nest). These eggs all develop in similar stages. First, the germinal stage where the single cell reproduces into a ball of cells called the blastocyst. Then the embryonic stage, where the cells form into different parts of the developing embryo's body parts and systems.

Differences- Live birth vertebrate/mammals develop with a placenta, while animals that hatch from eggs get their nutrition from a yolk.- Animals that develop in eggs are called embryos until they hatch. Mammals that develop in the womb will continue into a third stage of development called the fetal stage.- Far too many differences to list past initial similar patterns of devleopment (i.e. will the animal have limbs? A tail?)

Elephant

Dolphin with vestigial leg buds!

Alligator

Aww!

Insects are NOT vertebrates because they have exoskeletons!

First...

We are all vertebrate!

Even mammal embryos start out with a yolk sac!

Human


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