How many Mendelian disorders follow criss-cross inheritance?
Cystic fibrosis, Haemophilia, Sickle cell anaemia, Colour-blindness, Phenylketonuria, Thalassemia.

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Detailed Solution

Haemophilia and colour blindness are two X-linked recessive disorders which exhibit criss-cross inheritance. A grandfather passes the trait to grandson, where daughter acts as a carrier.

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