Look at image in details ,important topic for exams.


. Chromosome 21 is the smallest chromosome with 50 million bases.Trisomy of ch-21 causes down syndrome or down's syndrome.

2nd image-- remember characters.





Today I will write about down syndrome. Trisomy of chromosome 21
Syndrome -means ,Signs+symptoms seen in a person ,showing the presence of a particular disease for eg if a person is in love he will show love signs and symptoms. so you can say friend........ you are having love syndrome... and difference between symptoms and sign ..symptom is for patient ,means patient can recognize it while sign is discovered by doctor.

Down Syndrome—

It is a genetic disorder taking place during early life. Plz tell how many chromosomes will a person with down syndrome have??45/47 gues

ans -47,normal no of chromosome is 46 but due to trisomy it will become 47.

This extra chromosome causes problem with the way brain and body develops.

Look at the head here ...The head is smaller than normal and abnormally shaped. can you spot on .........some difference in eyes?

yes.............>>> the eyes are rounded at the inner corners (see your eyes in the mirror) just joking...


Other symptoms are in the image above.........