Created by StemPy LabThe figure shows a pedigree for a disorder controlled by one gene. Filled symbols are affected persons. Assume that no new mutation arises in the family. Which statement is correct?
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← Read the following statements about sex-linked disorders.
(i) Red-green colour blindness is due to a defect in either the red or the green cone of the eye.
(ii) Colour blindness occurs in about 8 per cent of males but only about 0.4 per cent of females.
(iii) The son of a woman who carries the gene for colour blindness has a 50 per cent chance of being colour blind.
(iv) A daughter of a carrier mother is not colour blind unless her father is colour blind.
(v) A haemophilic female is extremely rare, because her mother must be at least a carrier and her father haemophilic.
(vi) Queen Victoria was haemophilic, and so several of her descendants were haemophilic.
How many of the statements above are correct?Assertion (A): Thalassemia is a qualitative problem, in which an incorrectly functioning globin is made. Reason (R): In β thalassemia, production of the β-globin chain is affected; it is controlled by a single gene, HBB, on chromosome 11. →
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