When a child is born with trisomy, the mutation occurs at meiosis.
What do you mean by Trisomy?
Trisomy may be defined as a chromosomal disorder where an extra chromosome is present in the genome of affected individuals.
Trisomy may be arises due to the result of non-disjunction between chromosomes. When homologous chromosomes fail to separate at meiosis, it results in the increase of one germ cell.
It leads to germ cells containing 24 chromosomes, rather than 23.
Therefore, when a child is born with trisomy, the mutation occurs at meiosis.
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