Created by StemPy LabTwo statements about chromosomal disorders are given below. Statement I: Turner's syndrome, with the karyotype 45 with X0, is an example of aneuploidy. Statement II: Polyploidy, an increase in a whole set of chromosomes, results from a failure of cytokinesis after telophase, and it is often seen in plants.
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← The karyotype of a child shows 47 chromosomes, with three copies of chromosome 21 and a normal pair of sex chromosomes. Which set of features fits this disorder?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? →
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