People with Down syndrome have their own distinct physical and mental characteristics due to the presence of the 47th chromosome in the genome.
Down syndrome is a genetic pathology of a human genome, which is expressed in the presence of 47 chromosomes instead of the usual 46. This pathology is not uncommon and occurs on average about once in 1000 genera. People with Down syndrome have their own distinctive features of physical and mental development.
Physical features of people with Down syndrome
The presence of one superfluous chromosome in the human genome causes the appearance of the characteristic features of this pathology external signs:
- Flat face;
- Shortened skull;
- A special skin fold on the neck in newborn babies;
- Special eye cut;
- Hyperdependence of joints;
- Flat form of the nape;
- Underdevelopment of middle phalanges of fingers;
- Open mouth;
- Various dental anomalies;
- Short nose
Most of the external signs of a person with Down syndrome are due to the inherent delay of fetal development for this pathology. The presence of all these features in the appearance of people with Down syndrome is not a compulsory sign. At someone they are expressed stronger and are presented in full, at someone - barely noticeable features (it is noted presence of 1-2 external signs). However, scientists around the world have shown a connection between the prevalence of some congenital diseases and the presence of the 47th chromosome.
People with Down syndrome very often suffer from pathologies such as: