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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
Similar Questions
:Match the columns :
| Column $I$ |
Column $II$ |
| $(1)$ Albinism | $(p)$ recessive gene represented by HbsHbs. |
| $(2)$ Phenyl Ketonuria |
$(q)$ recessive gene represented by cc. |
| $(3)$ Sickle cell anaemia |
$(r)$ recessive gene represented by aa. |
| $4)$ Alkaptonuria | $(s)$ recessive gene represented by pp |
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