A) Colourblindness
B) Haemophilia
C) Syphilis
D) Both [a] and [b]
Correct Answer: D
Solution :
Colourblindness (red green colourblindness) and haemophilia (Bleeders disease) are sex-linked disease. Sex-linked trait of both are recessive and inherited in criss-cross manner, i.e., father passes the a-linked allele trait to daughter who passes it into grandson. Syphilis is sexually transmitted disease. It is caused by Treponema pallidum.
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