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Down syndrome is a genetic disorder that is also called trisomy 21. A person with Down Syndrome has an extra copy of chromosome 21. Which best describes the genetic mutation that results in Down syndrome.

Nondisjunction during meiosis, resulting in uneven distribution of chromosomes
Complete duplication of chromosomes during polyploidy
Translocation during genetic replication, creating nonhomologous chromosomes
Crossing over during meiosis, leading to an exchange of genetic information

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Down syndrome is  caused by the nondisjuction of the chromosome 21.

Non-disjunction of chromosomes refer to a situation in which chromosomes do not separate. When this occurs, an individual will have an abnormal number of chromosomes which results in a disorder such as the Down syndrome.

Disjunction of chromosomes occurs during the phase of meiosis called anaphase. Non-disjunction of chromosomes results in a phenomenon whereby a pair of chromosomes go to the same daughter cell.

Down syndrome results from nondisjunction during meiosis, resulting in uneven distribution of chromosomes.

Learn more: https://brainly.com/question/9782041

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Answer:

A

Explanation:

Nondisjunction during meiosis, resulting in uneven distribution of chromosomes

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