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A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy
- a)Must have normal colour vision
- b)May be colour blind or may be normal vision
- c)Will be partially colour blind since he is heterozygous for the colour blind mutant allele
- d)Must be colour blind
Correct answer is option 'B'. Can you explain this answer?
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A woman with normal vision, but whose father was colour blind, marries...
**Explanation:**
To understand the possible outcomes of the child's color vision, we need to consider the inheritance pattern of color blindness.
**Inheritance of Color Blindness:**
Color blindness is an X-linked recessive disorder, which means it is carried on the X chromosome. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
If a woman is a carrier of the color blindness gene (heterozygous), she has one normal X chromosome and one X chromosome with the color blindness gene. If a man is color blind, he has one X chromosome with the color blindness gene and one Y chromosome.
**Possible Genotypes of the Parents:**
In this scenario, the woman has normal vision but is a carrier of the color blindness gene because her father was color blind. Therefore, her genotype is X^N X^c, where X^N represents the normal vision allele and X^c represents the color blindness allele.
The man is color blind, so his genotype is X^c Y.
**Possible Genotypes of the Offspring:**
When the woman and the man have a child, there are four possible combinations of their gametes:
1. Woman's normal vision allele (X^N) and man's color blindness allele (X^c):
- Resulting in a daughter who is a carrier (heterozygous) for color blindness (X^N X^c) and a son with normal color vision (X^N Y).
2. Woman's normal vision allele (X^N) and man's normal vision allele (X^N):
- Resulting in a daughter with normal color vision (X^N X^N) and a son with normal color vision (X^N Y).
3. Woman's color blindness allele (X^c) and man's color blindness allele (X^c):
- Resulting in a daughter who is color blind (X^c X^c) and a son who is color blind (X^c Y).
4. Woman's color blindness allele (X^c) and man's normal vision allele (X^N):
- Resulting in a daughter who is a carrier (heterozygous) for color blindness (X^c X^N) and a son who is color blind (X^N Y).
**Conclusion:**
Based on the possible genotypes of the offspring, it is clear that the fourth child of this couple, who is a boy, may be either color blind or have normal color vision. Therefore, the correct answer is option B) "May be color blind or may have normal vision."
To understand the possible outcomes of the child's color vision, we need to consider the inheritance pattern of color blindness.
**Inheritance of Color Blindness:**
Color blindness is an X-linked recessive disorder, which means it is carried on the X chromosome. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
If a woman is a carrier of the color blindness gene (heterozygous), she has one normal X chromosome and one X chromosome with the color blindness gene. If a man is color blind, he has one X chromosome with the color blindness gene and one Y chromosome.
**Possible Genotypes of the Parents:**
In this scenario, the woman has normal vision but is a carrier of the color blindness gene because her father was color blind. Therefore, her genotype is X^N X^c, where X^N represents the normal vision allele and X^c represents the color blindness allele.
The man is color blind, so his genotype is X^c Y.
**Possible Genotypes of the Offspring:**
When the woman and the man have a child, there are four possible combinations of their gametes:
1. Woman's normal vision allele (X^N) and man's color blindness allele (X^c):
- Resulting in a daughter who is a carrier (heterozygous) for color blindness (X^N X^c) and a son with normal color vision (X^N Y).
2. Woman's normal vision allele (X^N) and man's normal vision allele (X^N):
- Resulting in a daughter with normal color vision (X^N X^N) and a son with normal color vision (X^N Y).
3. Woman's color blindness allele (X^c) and man's color blindness allele (X^c):
- Resulting in a daughter who is color blind (X^c X^c) and a son who is color blind (X^c Y).
4. Woman's color blindness allele (X^c) and man's normal vision allele (X^N):
- Resulting in a daughter who is a carrier (heterozygous) for color blindness (X^c X^N) and a son who is color blind (X^N Y).
**Conclusion:**
Based on the possible genotypes of the offspring, it is clear that the fourth child of this couple, who is a boy, may be either color blind or have normal color vision. Therefore, the correct answer is option B) "May be color blind or may have normal vision."
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A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boya)Must have normal colour visionb)May be colour blind or may be normal visionc)Will be partially colour blind since he is heterozygous for the colour blind mutant alleled)Must be colour blindCorrect answer is option 'B'. Can you explain this answer?
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A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boya)Must have normal colour visionb)May be colour blind or may be normal visionc)Will be partially colour blind since he is heterozygous for the colour blind mutant alleled)Must be colour blindCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boya)Must have normal colour visionb)May be colour blind or may be normal visionc)Will be partially colour blind since he is heterozygous for the colour blind mutant alleled)Must be colour blindCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boya)Must have normal colour visionb)May be colour blind or may be normal visionc)Will be partially colour blind since he is heterozygous for the colour blind mutant alleled)Must be colour blindCorrect answer is option 'B'. Can you explain this answer?.
A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boya)Must have normal colour visionb)May be colour blind or may be normal visionc)Will be partially colour blind since he is heterozygous for the colour blind mutant alleled)Must be colour blindCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boya)Must have normal colour visionb)May be colour blind or may be normal visionc)Will be partially colour blind since he is heterozygous for the colour blind mutant alleled)Must be colour blindCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boya)Must have normal colour visionb)May be colour blind or may be normal visionc)Will be partially colour blind since he is heterozygous for the colour blind mutant alleled)Must be colour blindCorrect answer is option 'B'. Can you explain this answer?.
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