Down Syndrome Was First Described by British Doctor Langdon Down

question 76

Multiple Choice

Down Syndrome was first described by British doctor Langdon Down in 1866.However,it was not until 1959 that French geneticist Jerome Lejeune first reported that individuals with Down Syndrome almost always possess an extra chromosome in which pair?

• A)Pair 22
• B)Pair 23
• C)Pair 21
• D)Pair 24

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