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A colour blind girl is rare because she will be born only when
- a)Her mother and maternal grand father were colour blind
- b)Her father and maternal grand father were colour blind
- c)Her mother is colour blind and father has normal vision
- d)Parents have normal vision but grand parents were colour blind
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
A colour blind girl is rare because she will be born only whena)Her mo...
Explanation:
Colour blindness is a genetic disorder that is inherited from parents who have the gene mutation. There are three types of cone cells in the retina of the human eye that are responsible for colour vision. These cone cells have different pigments that allow us to see different colours. The gene mutation responsible for colour blindness is located on the X chromosome.
Heading: Inheritance of colour blindness
- Colour blindness is a sex-linked recessive disorder, which means that the gene responsible for it is located on the X chromosome.
- Females have two X chromosomes, while males have one X and one Y chromosome.
- If a female inherits the colour blindness gene on one X chromosome, she will not be colour blind because the other X chromosome can compensate for it. However, she will be a carrier of the gene, which means that she can pass it on to her offspring.
- If a male inherits the colour blindness gene on his only X chromosome, he will be colour blind because he does not have another X chromosome to compensate for it.
Heading: Probability of having a colour blind child
- If a woman is a carrier of the colour blindness gene and her partner has normal vision, there is a 50% chance that their son will be colour blind and a 50% chance that their daughter will be a carrier of the gene.
- If a man is colour blind and his partner has normal vision, all their daughters will be carriers of the gene, but none of their sons will inherit it because they will receive a Y chromosome from their father.
Heading: Answer to the question
- The question asks which combination of parents and grandparents can result in a colour blind girl.
- The only option that can result in a colour blind girl is when her father and maternal grandfather were colour blind.
- This is because the girl would inherit the colour blindness gene from her father, and her mother would be a carrier of the gene from her father.
- The maternal grandfather being colour blind is important because he would have passed on the gene to his daughter (the girl's mother), who would then pass it on to her daughter.
Colour blindness is a genetic disorder that is inherited from parents who have the gene mutation. There are three types of cone cells in the retina of the human eye that are responsible for colour vision. These cone cells have different pigments that allow us to see different colours. The gene mutation responsible for colour blindness is located on the X chromosome.
Heading: Inheritance of colour blindness
- Colour blindness is a sex-linked recessive disorder, which means that the gene responsible for it is located on the X chromosome.
- Females have two X chromosomes, while males have one X and one Y chromosome.
- If a female inherits the colour blindness gene on one X chromosome, she will not be colour blind because the other X chromosome can compensate for it. However, she will be a carrier of the gene, which means that she can pass it on to her offspring.
- If a male inherits the colour blindness gene on his only X chromosome, he will be colour blind because he does not have another X chromosome to compensate for it.
Heading: Probability of having a colour blind child
- If a woman is a carrier of the colour blindness gene and her partner has normal vision, there is a 50% chance that their son will be colour blind and a 50% chance that their daughter will be a carrier of the gene.
- If a man is colour blind and his partner has normal vision, all their daughters will be carriers of the gene, but none of their sons will inherit it because they will receive a Y chromosome from their father.
Heading: Answer to the question
- The question asks which combination of parents and grandparents can result in a colour blind girl.
- The only option that can result in a colour blind girl is when her father and maternal grandfather were colour blind.
- This is because the girl would inherit the colour blindness gene from her father, and her mother would be a carrier of the gene from her father.
- The maternal grandfather being colour blind is important because he would have passed on the gene to his daughter (the girl's mother), who would then pass it on to her daughter.
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Community Answer
A colour blind girl is rare because she will be born only whena)Her mo...
Colourblindness is an X-linked genetic disorder. Since, boy carries only one copy of X chromosomes, the disorder is common in boys as only single defective gene is sufficient to cause colourblindness. However, a colourblind girl is rare as she needs two copies of defective genes to be colourblind. If her father has normal vision, then she will never show the disorder. Hence, out of the given options, option A, C and D are incorrect. In option B, her father is colorblind and her mother is carrier of the disorder as her maternal grandfather was colourblind. Hence, in this case, she can be born colourblind.
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A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer?
Question Description
A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer?.
A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer?.
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A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of A colour blind girl is rare because she will be born only whena)Her mother and maternal grand father were colour blindb)Her father and maternal grand father were colour blindc)Her mother is colour blind and father has normal visiond)Parents have normal vision but grand parents were colour blindCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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