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Gene for colourblindness is X-chromosome linked, and sons receive their sole from their mother, not from their father. Male-to-male inheritances is not possible for X-linked traits in humans. In the given case the mother of the child must be a carrier. (heterozygous) for colour blindness gene.
Tandemness in repeats provides many copies of the sequence for finger-printing, and variability in nitrogen base sequence in them. Being individual-specific, this proves to be useful in the process of DNA fingerprinting.
Methylated Guanine cap helps in binding of mRNA to smaller ribosomal sub-unit during initiation of translation. Poly– A tail provides longevity to mRNA’s life. Tail length and longevity of mRNA are positively correlated.