Zygote: Difference between revisions
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==Introduction== | ==Introduction== | ||
[[File:Early zygote.jpg|thumb|300px|Early Human Zygote, with 2 pronuclei]] | [[File:Early zygote.jpg|thumb|300px|Early Human Zygote, with 2 pronuclei]] | ||
The first diploid cell that forms following [[fertilization]] by fusion of the haploid [[oocyte]] (egg) and [[spermatozoa]] (sperm) resulting in the combination of their separate genomes. The first image shows the cell with the 2 pronuclei still present before fusion enclosed within the zona pellucida. In humans, this cell then undergoes a series of mitotic cell divisions, still enclosed within the zona pellucida, during the first few days of development to form 2 blastomeres then a solid cell mass called the [[morula]]. | The first diploid cell that forms following [[fertilization]] by fusion of the haploid [[oocyte]] (egg) and [[spermatozoa]] (sperm) resulting in the combination of their separate genomes. The first image shows the cell with the 2 pronuclei still present before fusion enclosed within the zona pellucida. In humans, this cell then undergoes a series of mitotic cell divisions, still enclosed within the zona pellucida, during the first few days of development to form 2 blastomeres then a solid cell mass called the [[morula]]. | ||
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==Human Zygote Size== | |||
Actual Size [[File:5cm ruler.jpg]] | |||
Enlarged Size [[File:Stage1 size with ruler.jpg]] | |||
==Parental Genomes== | ==Parental Genomes== |
Revision as of 17:38, 9 November 2010
Introduction
The first diploid cell that forms following fertilization by fusion of the haploid oocyte (egg) and spermatozoa (sperm) resulting in the combination of their separate genomes. The first image shows the cell with the 2 pronuclei still present before fusion enclosed within the zona pellucida. In humans, this cell then undergoes a series of mitotic cell divisions, still enclosed within the zona pellucida, during the first few days of development to form 2 blastomeres then a solid cell mass called the morula.
- Links: Fertilization | Week 1 | Morula | Blastocyst
Some Recent Findings
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Human Zygote Size
Parental Genomes
Movie of labeled genomes combining during first mitotic divisions in the mouse.
Formation of Zygote
- male and female pronuclei, 2 nuclei approach each other and nuclear membranes break down
- DNA replicates, first mitotic division
- sperm contributes centriole which organizes mitotic spindle
Movie - Pronuclear Fusion | Movie - Parental Genomes
Conceptus - term refers to all material derived from this fertilized zygote and includes both the embryo and the non-embryonic tissues (placenta, fetal membranes).
References
Journals
- Zygote An international journal dedicated to the rapid publication of original research in early embryology, Zygote covers interdisciplinary studies in animals and humans, from gametogenesis through fertilization to gastrulation.
Reviews
Articles
Search Pubmed
June 2010 "zygote" All (6213) Review (651) Free Full Text (1543)
Search Pubmed: zygote
Glossary Links
- Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link
Cite this page: Hill, M.A. (2024, June 16) Embryology Zygote. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Zygote
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G