Dictionary » E » Embryo



noun, plural: embryos

(zoology) A multicellular organism that primarily undergoes extensive and rapid growth and differentiation between the time of fertilization and fetal stage in higher forms while larval stage in lower forms

(human biology) Baby in the early developmental stage, after the zygote phase (at fertilization) to week eight from the time of fertilization (note: week eight from the time of fertilization is equivalent to 10 weeks gestational age)

(botany) A young, developing plant, such as the rudimentary plant inside the seed of higher plant forms or that inside the archegonium of mosses and ferns


In humans, the embryo refers to the growing organism after being a zygote and before being a fetus. The zygote becomes an embryo immediately after series of cell division. After the continuous cell division and differentiation in eight weeks, the embryo becomes a fetus in which the organism undergoes extensive organogenesis.

Word origin: Ancient Greek embruon (fetus), from en-, in- + bruĊ (grow, swell)

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Evolution/creation of marsupium:

Is it possible to plant/incorporate an embryo on leech? http://www.safeproject.net/wp-content/uploads/2012/11/2012-11-28-16.44.091.jpg

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by enarees
Sat Sep 13, 2014 8:28 am
Forum: Zoology Discussion
Topic: Evolution/creation of marsupium:
Replies: 2
Views: 323

Recessive and dominant genetics - Pitx1 case study

... a question that is pretty basic but still stumping me (maybe from burning my eyes with endless hours of reading) Question: How would a mouse embryo differ from the ones pictured above if the scientists were able to modify the regulatory regions of the mouse Pitx1 gene to be similar to those ...

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by scienceguy914
Mon Sep 08, 2014 1:44 am
Forum: Genetics
Topic: Recessive and dominant genetics - Pitx1 case study
Replies: 0
Views: 424

Humans are Deuterostomes. Right?..

Wiki says: In deuterostomes (including humans), the original dent (blastopore) becomes the anus, while the gut eventually tunnels through the embryo until it reaches the other side, forming an opening that becomes the mouth. But the thing is that, as I have found out, there is no archenteron ...

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by Siroggak
Tue Aug 12, 2014 4:46 pm
Forum: Human Biology
Topic: Humans are Deuterostomes. Right?..
Replies: 1
Views: 392

Human Gamete Compatibility Going Backwards

... homologous gene from the second parent. In theory, if neither parent organism has any such genes, the organisms are "compatible". Once embryo is formed, the new genome will dictate appearance of a new organism (whether it's going to be a hoof or a hand). Unless there is a serious clash ...

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by Cat
Sat Jan 11, 2014 7:56 pm
Forum: Evolution
Topic: Human Gamete Compatibility Going Backwards
Replies: 9
Views: 4841

2minute animation of a chicken embryo developing. 21 days

... I have just completed but didn't have a file to post in the Share Your Work area. The PoultryCRC have just developed an animation of a chicken embryo to help those teaching embryology. Not only is it scientifically accurate but it is also very beautiful. I've put it up on YouTube so it can ...

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by TeachMWell
Wed Nov 20, 2013 10:36 pm
Forum: General Discussion
Topic: 2minute animation of a chicken embryo developing. 21 days
Replies: 0
Views: 738
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