Hemophilia and colour blindness are :
X-linked recessive inheritance
The genes for clotting factor VIII/IX (haemophilia A/B) and for the red and green cone opsins (red–green colour blindness) are located on the X chromosome, and the defective alleles are recessive.
Males, having a single X chromosome (XY), express the trait whenever they inherit one defective allele, whereas females (XX) are usually heterozygous carriers. An affected father passes the allele to all his daughters but never to his sons, giving the typical criss-cross pattern.
The traits are not autosomal (they show sex bias) and not Y-linked (they are transmitted from carrier mothers and appear in females too), and they are not dominant.
Hence, the answer is X-linked recessive inheritance.
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