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प्रश्न
State any two symptoms of Down’s syndrome.
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उत्तर
Symptoms of Down syndrome are as follows :
1) Most children showed typical facial features with a fold of skin (epicanthal skin fold) over the inner corner of the eye. This results in downward slanting of eyelids
2) The face is typically flat and rounded flat nose, mouth open and tongue protruding
3) Mental retardation
4) Due to poor skeletal development, they have short stature and relatively small skull, the palate is arched.
5) Flat hand with characteristic crease which runs all the way across the palm (simian crease).
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संबंधित प्रश्न
Why are thalassemia and haemophilia categorized as Mendelian disorders? Write the symptoms of these diseases. Explain their pattern of inheritance in humans.
Identify ‘a’, ‘b’, ‘c’, ‘d’, ‘e’ and ‘f’ in the table given below:
| S. No. | Syndrome | Cause | Characteristics of affected individuals | Sex (male/female/both) |
| 1. | Down’s | Trisomy of 21 |
‘a’ |
‘b’ |
| 2. | ‘c’ | XXY | Overall masculine development | ‘d’ |
| 3. | Turner’s | 45 with XO |
‘e’ |
‘f’ |
What is the reason for the 21st trisomy?
Identify the option that correctly represents the number of chromosomes in Down syndrome.
Conditions of a karyotype 2n ± 1 and 2n ± 2 are called ______.
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.
Which of the folowing is a correct match?
What are chromosomal disorders?
At what level does the defect occur in Mendelian disorders?
