A) Y chromosome
B) 13th chromosome
C) X chromosome
D) 21st chromosome
Correct Answer: C
Solution :
The genes located exclusively on X-chromosomes are called sex-linked or X-linked, the genes that occur only on the Y-chromosome are called holandric and the gene present on homologous regions in sex chromosomes are called XY-linked genes. The most important and common X-linked disease are red-green colour blindness, haemophilia, Duchenne muscular dystrophy and fragile X syndrome.
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