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Embryo Science Project

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Emily s

on 14 October 2016

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Transcript of Embryo Science Project

Common Ancestry through Embryological Development
Embryos
Chicken
Sharks
Proof of Common Ancestry
Human embryos share many common features with other beings.
Common ancestry can be proven through the appearance of embryos
Evolution can be seen through the appearance of embryos.
Human
Arches
Arches
In sharks, arches develop into gill slits that allow them to breathe.
Shared with:
-Most creatures, including humans.
Notochord

Notochords
Our spinal chords start out as notochords. As we develop, this long piece of cartilage splits into discs that cushion our vertebra.
Shared with:
all vertebrates and some other animals, i.e. sharks
1. https://en.wikipedia.org/wiki/Development_of_the_nervous_system_in_humans
2. http://www.pbs.org/wgbh/nova/evolution/guess-embryo.html
3.http://www.uchospitals.edu/news/2012/20120613-sharks.html

Bibliography
In humans, arches develop into parts of our head- bones, muscles, arteries, etc.
Shared with:
-Most creatures, including sharks and aquatic animals.
Tail
In early stages of embryological development, humans have small tails.
Shared with:
all mammals and some
invertebrates

Hox Genes
Hox genes are like blueprints for our body and how it develops.
Shared with:
All animals
Tail
Notochord
In chickens and in all vertebrates, the notochord develops into the spinal chord
Shared with:
most animals
You can find proof of common ancestors by looking at similarities in how two embryos look and develop. The next slides talk about common ancestors of humans, sharks, and chickens.
As you can see, all of these animals have at least one of these traits in common as they develop.
Common Ancestry Between Humans and Chickens
1. They're both vertebrates and share a notochord in early stages of embryonic development and spines later on
2. They both have tails
3. They both have arches

1. Chickens are reptiles while humans are mammals, so they split at least 320 million years ago. Any ancestor they shared would be very distant.
2. Humans loose heir tails before they are born, while chickens keep theirs, even though they are both vertebrates.
3. Human's brains are much more developed than chickens, as are our eyes and other organs.

However:
Arches
Hox genes
Hox genes are like blueprints for our body and how it develops. Shared with: All animals
Common Ancestry Between Humans and Sharks
1. They both share a notochord in early stages of development
2. They both have hox genes
3. They both have tails and arches

Tail
Hox Genes
However:
1. Humans are mammals and sharks are a species of fish, so they had to split, again, at least 320 million years ago.
2. Humans have skeletons made of bones, while a shark's skeleton is made entirely out cartilage.
3. A human's notochord splits and develops into a spine, while a shark's remains cartilage.
Thanks For Watching!!
For sharks, their tails stay with them forever, and help them swim once they're born
Shared with:
All mammals and most other animals
In sharks and many other animals, the notochord acts as a spinal chord.

Shared with:
-Humans, all vertebrates, and some other animals.
Full transcript