Principle-Of-Inheritance-And-Variation Question 619
Question: Colour blindness is found more in males than in females because [MP PMT 1992]
Options:
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
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Answer:
Correct Answer: A
Solution:
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.
BETA
