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4.Principles of Inheritance and Variation
medium
Colour blindness is
A
Sex-linked recessive disease
B
Sex-linked dominant disease
C
Autosomal dominant disease
D
Autosomal recessive disease
Solution
Colour Blindness
$(i)$ It is a sex-linked recessive disorder
$(ii)$ It results in defect in either red or and green cone cells of eye resulting in failure to discriminate between red and green colour
$(iii)$ The gene for colour blindness is present on $X$-chromosome
$(iv)$ It is observed more in males $\left(X^{c} Y\right)$ because of presence of only one $X$-chromosome as compared to two chromosomes in famales
Standard 12
Biology
