- Home
- Standard 12
- Biology
4.Principles of Inheritance and Variation
medium
Colour blindness is found more in males than in females because
A
The males containing the single affected $X$ chromosome are colour blind
B
Heterozygous females are colour blind
C
Males having affected $Y$ chromosome are colour blind
D
Affected $X$ chromosome has much high affinity to $Y$ chromosome as compared to unaffected $X$ chromosome
Solution
(a) Because colour blindness is a recessive sex-linked disease, genes of which are present exclusively on non-homologous segment of $X$ chromosome,
so males need only one affected chromosome to express the character whereas females need both the affected chromosomes to exhibit the same.
Standard 12
Biology
