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Question
Name a disorder a human suffers from as a result of the monosomy of the sex chromosome. Give the karyotype and write the symptoms.
Solution
Turner's Syndrome is a result of the monosomy of the sex chromosome in humans.
Its karyotype is XO i.e. 45 chromosomes.
Symptoms -
- short stature
- lack of the development of the ovaries
- lack of secondary sexual characteristics
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RELATED QUESTIONS
Identify 'a', 'b', 'c',’d’, 'e' and 'f' in the table given below:
| No. | Syndrome | Cause | Characteristics of affected individuals | Sex Male/Female/Both |
| 1. | Down's | Trisomy of 21 | 'a' (i) (ii) |
'b' |
| 2. | 'c' | XXY | Overall masculine development. |
'd' |
| 3. | Turner's | 45 with XO | 'e' (i) (ii) |
'f' |
Match the column-I with column-II and re-write the matching pairs.
| Column-I | Column-II |
| 1. 21 trisomy | a. Turner’s syndrome |
| 2. X-monosomy | b. Klinefelter’s syndrome |
| 3. Holandric traits | c. Down's syndrome |
| 4. Feminized male | d. Hypertrichosis |
Write a note on Down’s syndrome.
Mention the symptoms of Phenylketonuria.
Identify the characteristics that are observed in an individual suffering from Klinefelter syndrome.
i. Gynaecomastia, under developed testis and no spermatogenesis.
ii. Voice pitch is harsh.
iii. They are tall with long arms.
Select the incorrect statement regarding pedigree analysis.
It is said, that the harmful alleles get eliminated from population over a period of time, yet sickle cell anaemia is persisting in human population. Why?
Short stature in females, webbed neck absence of menstrual cycle and sterility are characteristics which of the following disease?
Give definition of non-disjunction.
What are chromosomal disorders?
