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4.Principles of Inheritance and Variation
medium
All sons of a couple are colourblind because
A
Mother is homozygous colourblind
B
Mother is heterozygous and father normal
C
Mother is heterozygous and father colourblind
D
Mother is normal and father colourblind
Solution
(a)Whenever mother is homozygous colour blind, all her sons will be colourblind irrespective of their father's nature.
Standard 12
Biology
