Biology · Cell Cycle

Down’s syndrome is a genetic condition in which the 21st chromosome fails to segregate, leading to physical and mental developmental delay and disabilities. Down syndrome symptoms include distinctive physical features like upward slanting eyes, a flattened face, a short neck, and small ears, hands, and feet, along with low muscle tone and loose joints. Individuals also experience intellectual and developmental delays, and may face other health issues such as heart problems, hearing loss, gastrointestinal issues, and vision problems.  

Chromosome 7 is not associated with Down's syndrome. Down's syndrome, also known as trisomy 21, is caused by the presence of an extra copy of chromosome 21. 

Chromosome 18 is not associated with Down's syndrome. It is associated with another genetic disorder called Edward's syndrome, also known as trisomy 18. 

It is genetic disorder in which 21 pair of chromosomes fail to segregate and as a result it lead to physical and mental development disability and delay and this is called Down's syndrome.

Chromosome 19 is not associated with Down's syndrome. It is a different chromosome that is not related to the condition.