Q. 8

Why is the frequency of red-green colour blindness is many times higher in males than that in the females?

Answer :

Colour blindness is common hereditary condition which means it is passed down from parents. Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome. The faulty gene for colour blindness is found only on the X chromosome. When the father is colour blind, he can only pass an X chromosome to his daughter. Thus she acquires the gene and become the carrier of the disease. While a mother who can pass the X chromosome to both son and daughter. For a son to be colour blind, it is enough for his mother to be a carrier. But for a daughter to be colour blind her father should be colour blind and mother who is a carrier of colour blindgene. For a daughter to be a carrier it is enough to get the faulty gene from carrier mother or colour blind father.

Thus males have higher frequency to be colour blind than females.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
How to solve applied questions based on Mendel's law of inheritanceHow to solve applied questions based on Mendel's law of inheritanceHow to solve applied questions based on Mendel's law of inheritance46 mins
Everything About Genetic DisordersEverything About Genetic DisordersEverything About Genetic Disorders55 mins
Basic Quiz - Principles of Inheritance & VariationBasic Quiz - Principles of Inheritance & VariationBasic Quiz - Principles of Inheritance & Variation53 mins
Advanced Quiz - Principles of Inheritance & VariationAdvanced Quiz - Principles of Inheritance & VariationAdvanced Quiz - Principles of Inheritance & Variation46 mins
Interactive Quiz on Principles of Inheritance and VariationInteractive Quiz on Principles of Inheritance and VariationInteractive Quiz on Principles of Inheritance and Variation33 mins
Medelian disorder series: Thalassemia, Sickle cell anaemia & PhenylketonuriaMedelian disorder series: Thalassemia, Sickle cell anaemia & PhenylketonuriaMedelian disorder series: Thalassemia, Sickle cell anaemia & Phenylketonuria60 mins
Pedigree chartPedigree chartPedigree chart58 mins
How to solve questions of pedigree chartHow to solve questions of pedigree chartHow to solve questions of pedigree chart49 mins
Meselson and Stahl experimentMeselson and Stahl experimentMeselson and Stahl experiment49 mins
Interactive Quiz on Molecular basis of Inheritance-02Interactive Quiz on Molecular basis of Inheritance-02Interactive Quiz on Molecular basis of Inheritance-0234 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses