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प्रश्न
About 8% of the human male population suffers from colour blindness, whereas only about 0.4% of the human female population suffers from this disease. Write an explanation to show how it is possible.
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उत्तर
Colour blindness is a sex-linked disorder and is caused by a recessive gene located on the X chromosome. The Y chromosome of male does not carry any gene for colour vision and the defect appears in the presence of a single recessive gene (XcY). As a result, colour blindness is more common in males (8%) as compared to females (0.4%).
संबंधित प्रश्न
Why are color-blindness and thalassaemia categorised as Mendelian disorders? Write the symptoms of these diseases seen in people suffering from them.
A colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.
Why is pedigree analysis done in the study of human genetics? State the conclusions that can be drawn from it.
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 |
Give a detail account of thalassemia.
What are the different characters that develop due to Klinefelter's syndrome?
A person with 47 chromosomes due to an additional Y-chromosome suffers from a condition called ______.
The technique exployed in human genetic counselling is:
Why is the frequency of red-green colour blindness is many times higher in males than that in females?
Mention any one symptom of Turner's syndrome.
