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Question
Red, green colour blindness is a sex-linked trait. Which of the given statements is not correct regarding colour blindness?
Red, green colour blindness is a sex-linked trait. Which of the given statements is not correct regarding colour blindness?
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Solution
The correct option is B Males can be carriers of the trait
Colour blindness is a common hereditary (inherited) condition The gene (allele) b for colour blindness is recessive to the gene B for normal vision. The gene b is carried only on the X chromosome. X-linked red-green color blindness is a recessive trait. Females heterozygous for this trait have normal vision, while males heterozygous for this trait, which have only one X chromosome will always be affected(diseased).
Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines sex. Since colorblindness is a sex-linked recessive trait and males just have one X chromosome, they can never be the carriers. Males will always express the disease/phenotype.
So, the correct answer is (C).
Colour blindness is a common hereditary (inherited) condition The gene (allele) b for colour blindness is recessive to the gene B for normal vision. The gene b is carried only on the X chromosome. X-linked red-green color blindness is a recessive trait. Females heterozygous for this trait have normal vision, while males heterozygous for this trait, which have only one X chromosome will always be affected(diseased).
Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines sex. Since colorblindness is a sex-linked recessive trait and males just have one X chromosome, they can never be the carriers. Males will always express the disease/phenotype.
So, the correct answer is (C).
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