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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
Give any 'two' names of X-linked diseases
Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-flies for his experiments? State any three reasons.
In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?
Mental retardation in man associated with sex chromosomal abnormality is usually due to ______.
Down’s syndrome is due to ______.
A person with 47 chromosomes due to an additional Y-chromosome suffers from a condition called ______.
Trisomy is represented by ______.
Read the following and answer from given below:
Turner's syndrome is an example of monosomy. It is formed by the union of an allosome-free egg and a normal 'X' containing sperm or a normal egg and an allosome-free sperm. The individual has 2n = 45 chromosomes (44 + X0) instead of 46. Such individuals are sterile females who have rudimentary ovaries, underdeveloped breasts, small uterus, short stature, webbed neck, and abnormal intelligence. They may not menstruate or ovulate. This disorder can be treated by giving female sex hormones to women from the age of puberty to make them develop breasts and have menstruation. This makes them feel more normal.
Turner's syndrome is a/an ______
Identify chromosomal disorder caused due to non-disjunction of the 21st number of chromosomes and enlist its symptoms.
Match the disorder in column I with their nature in column II.
| Column I | Column II | ||
| i. | Thalassemia | a. | X monosomy |
| ii. | Turner’s syndrome | b. | Extra X chromosomes in male |
| iii. | Klinefelter’s syndrome | c. | 21st Trisomy |
| iv. | Down’s syndrome | d. | Mendelian disorder |
