One chromosomal abnormality that is usually fatal is

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The addition of an extra autosomal chromosome, also known as trisomy, is often fatal for the fetus or results in severe physical and intellectual disabilities, such as in the case of Down syndrome. Mutations in genes on chromosomes can also have serious consequences, but not all mutations are fatal. The exchange of material between homologous chromosomes, known as chromosomal translocations, can also cause health problems but not necessarily fatal. A change in the number of sex chromosomes, such as XXY or XXX, can result in various genetic conditions but are generally not fatal.

One Chromosomal Abnormality That Is Usually Fatal Is