3 Different Kinds of DS and Sharing Sunday

Continuing with the DS Awareness month posts, since it's almost over! :) As I mentioned in here, there are 3 different kinds of Down Syndrome.

Trisomy 21

Lyla has Trisomy 21, and she still needs a family!!!

The vast majority, or about 95%, of people with DS have Standard Trisomy. This is what both my little brothers, and (I think) all the kids with DS I have posted about have. I explained about Trisomy 21 in this post - What is Down Syndrome?


Translocation
Translocation is the second type of DS, and is pretty rare, as it only makes up for about 4% of the population of people with DS. Translocation is caused when a piece of chromosome 21 is located on another chromosome such as chromosome 14. The person with Translocation Trisomy 21 will have 46 chromosomes but will have the genetic material of 47 chromosomes. The person with Translocation Trisomy 21 will exhibit all the same characteristics of a person with Standard Trisomy 21 since they have three copies of chromosome 21.


Mosaicism

Sweet Danil has Mosaicism, and he just got home!!! :)

Mosaicism is the third type of DS, and is extremely rare - only about 1% percent of all people with Down Syndrome have it. Mosaicism is when a person has a mix of cells, some containing 46 chromosomes and some containing 47 chromosomes. This occurs either because: a) The person received 46 chromosomes at fertilization but somewhere during early cell division the chromosome 21 cell pairs failed to split creating a cell with 47 chromosomes and a cell with 45 chromosomes. The cell with 45 chromosomes can not survive but the cell with 47 chromosomes will continue to divide. All cells that come from this cell will contain 47 chromosomes. b) The person received 47 chromosomes at fertilization but later during cell division the extra chromosome is lost. Mosaicism occurs in 2% to 5% of cases of Down syndrome. A person with Mosaic Down syndrome may exhibit all, some, or none of the characteristics of Down syndrome depending on the percent of cells carrying the extra chromosome and where these cells are located.

(Info from Down Syndrome: For Parents and Down Syndrome)

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On a side note, please go join Jane and link up over at Flight Living Platform for her Sharing Sunday. Jane is the same awesome person who does the Forget Me Not Friday link-ups! She was soo sweet to me this week and posted about me for her SS post! Thanks soo much Jane! ♥♥♥ You are such an encouragement to me! If you are here from her post, THANK YOU SO MUCH! Be sure to comment and let me know you visited! :)