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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 an example of a human disorder that is caused due to a single gene mutation.
Attempt any TWO of the following:
‘The gene for sickle cell anaemia in homozygous condition is lethal and produces sickle cell trait in heterozygous carrier’. Explain.
What do sex linked traits appear in males than in females?
Read the following statements and select the correct option.
i. Genetic disorders are broadly categorised as, Mendelian disorders and chromosomal disorders.
ii. Mendelian disorders are caused due to absence or excess of one or more chromosomes or their abnormal arrangement.
iii. Chromosomal disorders are mainly caused due to alteration or mutation in the gene.
Identify I and II in the given diagram of chromosome.
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Identify the correct statement from the following.
A short stature with webbing of neck and low posterior hairline indicates ______ syndrome.
In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?
A woman with albinic father marries an albinic man. The proportion of her progeny is ______.
Clotting of blood is to ______.
