Gujarati
Hindi
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

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