31 for 21: Day 15

Down syndrome and Trisomy 21 

Down syndrome got its name in the late 19th century.

An English physician described a person with the characteristics, known now as Down syndrome in 1866 and had his work published.

His name was John Langdon Down, Down syndrome is named after him.

Down syndrome is also known as Trisomy 21.

In 1959, a French physician Jérôme Lejeune, identified Down syndrome as a chromosomal condition. He observed that individuals with Down syndrome had 47 chromosomes. A third copy of the 21st chromosome being full or partially present in these individuals.

Down syndrome and Trisomy 21 are two names used for the same chromosomal condition.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s