Advertisements
Advertisements
प्रश्न
Write a note on Down’s syndrome.
उत्तर
Down syndrome:
- Individuals suffering from Down syndrome will have 47 chromosomes instead of the normal number 46.
- 21st Trisomy occurs due to non-disjunction or failure of separation of chromosomes (autosomes) during gamete formation.
- Following are the symptoms of Down syndrome:
- Mild or moderate mental retardation and poor skeletal development.
- Distinct facial features like small head, ears, and mouth.
- The face is typically flat and rounded with a flat nose, open mouth, and protruding tongue.
- Eyes slant up and out with internal epicanthal folds.
- Flat hands and stubby fingers, the palm is broad with a single palmer crease.
APPEARS IN
संबंधित प्रश्न
Name the disorder caused by under secretion of thyroxine in children
Which of the following traits is never observed in a human female?
Very Short Answer Question.
Give an example of a chromosomal disorder caused due to nondisjunction of autosomes.
What is the reason for the 21st trisomy?
Choose the correct option which appropriately classifies the following disorders into Mendelian and chromosomal disorders:
Colour blindness, Down syndrome, Sickle cell anaemia, Turner syndrome, Thalassemia, Haemophilia, Phenylketonuria, Klinefelter syndrome.
HbA and HbS alleles of normal and sickle celled RBC are ______.
If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is ______.
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
A disease caused by an autosomal primary non-disjunction is ______.
Describe Klinefelter’s syndrome.
