Gene dosage, the number of copies of a particular gene, can dramatically impact health; for example, three copies of chromosome 21 cause Down syndrome.

Despite being vital for organismal development, many genetic diseases, such as Tay-Sachs disease, can cause severe neurodegeneration and early death due to the accumulation of toxi...

Warren Tay

Mitochondrial DNA mutations can cause a range of severe genetic diseases, such as MELAS syndrome, which affects the brain, nervous system, and muscles.

Some genetic diseases, like Duchenne muscular dystrophy, are X-linked recessive, meaning they primarily affect males because they only have one X chromosome, so a single faulty gen...

Guillaume Duchenne

Some people have 47 chromosomes instead of 46, a condition like Klinefelter syndrome (XXY), leading to distinct physical and developmental characteristics.

Harry Klinefelter

Some genetic diseases, like trinucleotide repeat disorders (e.g., Huntington's), are characterized by an unstable expansion of DNA repeats, which can increase in length across gene...