In the Karyotype of a Person with Down Syndrome, or Trisomy

question 24

Essay

In the karyotype of a person with Down syndrome, or trisomy 21, an extra copy of chromosome 21 is apparent. This abnormality affects roughly 1 of every 700 children born and is the most common serious birth defect in the United States. People affected by Down syndrome often have mental retardation and shortened life spans.
Based on this scenario and your understanding of meiosis, what is the most likely explanation for the extra chromosome in people with Down syndrome?

---

Definitions:

Investment Acceptance

The approval process for allocating resources or capital into investments, projects, or financial assets.

Payback Period

is the duration needed to recoup the cost of an investment, calculating the time it takes for returns to cover costs.

Average Accounting Return

A financial ratio that compares the average net income to the average investment made in a company.

Payback Method

A method in capital budgeting that measures the duration needed to recover an investment's expenses.