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# Developmental genetics

The signals that shape the embryo, and what happens when they fail.

6 pages

## Topics

- [**Molecular regulation: Shh, Wnt, FGF, BMP, Hox genes and retinoic acid** A handful of chemical signals tells each embryonic cell where it is and what to become](https://durgical.com/en/embryology/molecular-regulation-shh-wnt-fgf-bmp-hox-genes-and-retinoic-acid/)
- [**Weeks 3–8: the embryonic period and organogenesis** Between weeks three and eight every organ forms; it is when the embryo is most vulnerable to…](https://durgical.com/en/embryology/weeks-3-8-the-embryonic-period-and-organogenesis/)
- [**Principles of teratology: critical periods, dose and genotype** Why the same drug, virus or exposure can do nothing, cause a miscarriage or cause a birth…](https://durgical.com/en/embryology/principles-of-teratology-critical-periods-dose-and-genotype/)
- [**Holoprosencephaly** The forebrain does not divide properly into two halves; the midline of the face is affected too…](https://durgical.com/en/embryology/holoprosencephaly/)
- [**Achondroplasia (FGFR3)** The most common cause of short stature with short limbs: an overactive gene slows the growth of…](https://durgical.com/en/embryology/achondroplasia/)

## Conditions and syndromes

- [**CHARGE syndrome** A genetic syndrome named for its main features: coloboma, heart defects, choanal atresia, growth…](https://durgical.com/en/conditions/charge-syndrome/)

[← Medical genetics](https://durgical.com/en/genetics/)

This section is an index: it gathers pages from Biochemistry, Pathology, Embryology and other sections without repeating them. Educational content; it does not replace a geneticist's assessment or genetic counselling.

Representative model, for educational purposes only.

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Source: https://durgical.com/en/genetics/development/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/genetics/development/