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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
Give the importance of heterocyst in cyanobateria.
Identify I and II in the given diagram of chromosome.
Match Column I with Column II and select the correct option:
| Column I | Column II | ||
| p. | Pleiotropy | I. | More than two alleles occur at the same locus on homologous chromosomes |
| q. | Multiple alleles | II. | Expression of both the alleles m heterozygous condition |
| r. | Polygenic | III. | Multiple effect of single gene |
| s. | Co-dominance | IV. | Single phenotypic character influenced by more than two genes |
Conditions of a karyotype 2n ± 1 and 2n ± 2 are called ______.
If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is ______.
The most striking example of point mutation is found in a disease called ______.
Clotting of blood is to ______.
Give the genotype of Klinefelter’s syndrome.
Which diagnostic method is used to detect chromosomal disorders?
Which disorder affects haemoglobin production?
