Individuals with down syndrome have an extra chromosome 21. This is an example of which type of chromosome disorder?

Down syndrome is an example of NON DISJUNCTION CHROMOSOME DISORDER. Non disjunction disorder occur when the homologous chromosomes or sister chromatids fail to separate properly during cell division. This failure results in daughter cells with abnormal chromosomes. Another example of non disjunction disorder is Turner syndrome.

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lucasolvfranco lucasolvfranco · Answer 2 · 2019-10-31T20:49:40+01:00

Answer:

Aneuploidy - Non-disjunction

Explanation:

Aneuploidies are chromosomal abnormalities (the most common) that cause changes in the number of chromosomes, characterized by the gain or loss of one or more chromosomes in the genome.

Aneuploidies usually occur due to a non-disjunction error (a problem of segregation of homologous chromosomes in sister chromatids) during maternal cellular meiosis, but may also occur in paternal meiosis, although this is less common.

This type of anomaly can occur on both autosomal and sexual chromosomes, causing various disorders, such as down syndrome, caused by trisomial chromosome 21 (autosomal), and Turner syndrome, caused by monosomy X (sexual).