Biology - Principles of Inheritance and Variation Question with Solution | TestHub

Red-green colour blindness is a sex-linked recessive disorder caused by a defect in the genes located on the X chromosome.

Males have an XY sex chromosome pair, while females have XX. A father passes his Y chromosome to his son and his X chromosome to his daughter.

Since the gene for red-green colour blindness is present on the X chromosome, a colourblind father cannot pass this defective gene to his son. Instead, criss-cross inheritance is observed where the trait is passed from a carrier mother to her son.

Thus, the statement that it is inherited from a colourblind father to his son is incorrect.

Answer: It is inherited from a colorblind father to his son.