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Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91]
8 Μαρ 2018 · Most children with Down syndrome have mild to moderate cognitive impairment. Language is delayed, and both short and long-term memory is affected. When to see a doctor. Children with Down syndrome usually are diagnosed before or at birth.
8 Αυγ 2023 · Down syndrome (trisomy 21) is a genetic disorder caused by the presence of all or a portion of a third chromosome 21. Patients typically present with mild to moderate intellectual disability, growth retardation, and characteristic facial features.
23 Φεβ 2024 · People with Down syndrome have an extra chromosome that impacts their looks and their ability to think, learn, and reason. Discover the type, causes, and kinds of effects it can have.
16 Οκτ 2024 · Down syndrome, congenital disorder caused by the presence in the human genome of extra genetic material from chromosome 21. The physical features of Down syndrome were first described in 1866 by British physician John Langdon Down. Learn more about the types, symptoms, and diagnosis of Down syndrome.
Down syndrome is an abnormality of chromosome 21 that can cause intellectual disability, microcephaly, short stature, and characteristic facies. Diagnosis is suggested by physical anomalies and abnormal development and confirmed by cytogenetic analysis. Management depends on specific manifestations and anomalies.
31 Ιαν 2023 · Down syndrome is a genetic condition where a person is born with an extra copy of chromosome 21. This means that they have a total of 47 chromosomes instead of 46. This can affect how their brain and body develop. People diagnosed with Down syndrome have happy and healthy lives with supportive care.
