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Biology
Colour blindness
What is colour blindness? What kind of retinal cells are lacking in a person suffering from this defect?
Biology
Colour blindness
A woman with normal vision marries a man with normal vision and gives birth to a colour blind son. Her husband dies and she marries a colour blind man. What is the probability of her children having the abnormality?
A. $50%$ colour blind sons $+50%$ colour blind daughters
B. All sons colour blind and daughter carrier
C. All daughters colour blind and sons normal
D. $50%$ sons colour blind and all daughters normal
Biology
Colour blindness
Explain why generally the male child suffers from the colour blindness and not the female?
Biology
Colour blindness
Girl of normal vision whose father was colour blind marries a man of normal vision whose father was also colour blind. The sons of this marriage would be
A. All normal
B. All colour blind
C. 50% colour blind
D. 25% colour blind
Biology
Colour blindness
A colorblind man marry with a daughter of colourblind father,the generation will be
A. There will be no daughter colourblind
B. All sons will be colourblind
C. All daughter will be colourblind
D. Half of the sons will be colourblind
Biology
Colour blindness
A couple with normal vision bear a colour blind child. Work out a cross to show how it is possible and mention the sex of the affected child.
Biology
Colour blindness
A colorblind man ${ X }^{ c }{ Y }$ has a color-blind sister ${ X }^{ c }{ X }^{ c }$ and a normal brother (XY). What is the genotype of father and mother?
A. ${ { X } }^{ C }{ Y }$, ${ { X } }^{ C }{ X }^{ C }$
B. ${ { X } }^{ C }{ Y }$, ${ { X } }^{ C }{ X }$
C. XY, ${ { X } }^{ C }{ X }^{ C }$
D. XY, ${ { X } }^{ C }{ X }$
Biology
Colour blindness
A normal woman is married to a colour blind man. The children are expected to be
A. All normal
B. $50\% $ sons are colour blind
C. All daughters are normal but carrier whereas all sons are normal phenotypically as well as genotypically
D. $50\% $ daughters are colour blind
Biology
Colour blindness
Why are colour blindness and thalassemia considered as Mendelian Disorders? Write symptoms of these diseases seen in people suffering from them.About 8% of the human male population suffers from colour blindness whereas only 0.4% of the human female population suffers from these diseases. Write an explanation to show how it's possible.
Biology
Colour blindness
A colour blind son is born to normal parents. It shows that
A) The father was heterozygous for colour blindness
B) The mother was genotypically homozygous
C) The mother was heterozygous for colour blindness
D) Both parents carried a recessive gene for the disorder.

Biology
Colour blindness
A man whose father was color blind marries a woman who had color blind mother and the normal father. What percentage of male children of this couple will be color blind?
(A) 0%
(B) 50%
(C) 75%
(D) 25%


Biology
Colour blindness
What is the cause of colour blindness?
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