A) all normal
B) all colourblind
C) all sons colourblind
D) some sons colourblind and some normal
Correct Answer: C
Solution :
Woman is a carrier of gene since her father was colourblind. The gene for colour blindness is recessive and carried on the X-chromosomes \[{{X}_{c}}\]stands for the X-chromosome carrying the colour, blindness gene.\[X\] | \[{{X}_{c}}\] | |
\[{{X}_{c}}\] | \[X{{X}_{c}}\] | \[{{X}_{c}}{{X}_{c}}\] |
\[Y\] | \[XY\] | \[{{X}_{c}}Y\] |
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