Principle of Inheritance and VariationMedium
Question
Of both normal parents, the chance of a male child becoming colourblind are
Options
A.no
B.possible only when all the four grand parents had normal vision
C.possible only when father′s mother was colourblind
D.possible only when mother′s father was colourblind
Solution
Colourblindness is a X-linked recessive disease and the chance of a male child becoming colourblind of a normal parents is only when mother′s father was colourblind.
This is Criss-cross inheritance in which genes are transferred to a child from his maternal grandfather through his mother.
This is Criss-cross inheritance in which genes are transferred to a child from his maternal grandfather through his mother.
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