What Percentage of Down Syndrome Cases Are Due to an Extra

question 117

Multiple Choice

What percentage of Down syndrome cases are due to an extra number 21 chromosome?

• A)Very few (less than 1%)
• B)Few (10-15%)
• C)A moderate amount (35-55%)
• D)Almost all (95% or more)

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Definitions:

Counter

A variable used in programming to tally occurrences or to keep track of incremental repetitions in control structures like loops.

Logical Expression

A statement that can be evaluated to true or false, often used in decision-making structures in programming.

For Loop

A for loop is a control flow statement in programming that allows code to be executed repeatedly based on a condition and iteration expression.

Value Of X

A general expression referring to the value assigned to the variable "X".