This mode of inheritance is in contrast to the inheritance of traits on autosomal chromosomes, where both sexes have the same probability of expressing the trait.
Since, in humans, there are many more genes on the X than there are on the Y, there are many more X-linked traits than there are Y-linked traits.
In mammals, the female is the homogametic sex, having two X chromosomes (XX), while the male is heterogametic,
having one X and one Y chromosome (XY). Genes that are present on the X or Y chromosome are called sex linked genes.
As for your SPM, the diseases focussed are : Haemophilia and Coloured-blindness..
Take special care when constructing the genetic Diagrams to show the ratio of the offsprings...
Refer your Reference Book for details of the Diagram..
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