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One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following informations is most appropriate?
[1999]
  • a)
    The mother must have been heterozygous
  • b)
    The child is a monozygotic twin
  • c)
    The other child is a female and the father is haemophilic
  • d)
    The haemophilic child is a male
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
One child is haemophilic (sex-linked trait), while its fraternal twin ...
The mother must have been a haemophilic carrier (XhX). One of  the twins would have inherited the normal X chromosome and the other would have received the X chromosome carrying the gene for haemophilia.
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Most Upvoted Answer
One child is haemophilic (sex-linked trait), while its fraternal twin ...
The most appropriate information in this scenario is that the mother must have been heterozygous for the haemophilia gene.

Explanation:
Haemophilia is a sex-linked trait, meaning it is carried on the X chromosome. Males have one X and one Y chromosome, while females have two X chromosomes. If a male inherits the haemophilia gene on his X chromosome, he will have the disorder because he does not have a second X chromosome to compensate for the faulty gene. On the other hand, females have two X chromosomes, so even if they inherit the haemophilia gene on one X chromosome, the other X chromosome can often provide enough functional copies of the gene to prevent the disorder.

Given that one child is haemophilic (male) and the other child is normal (sex not specified), we can conclude that the mother must have been heterozygous for the haemophilia gene. This means that she carries one normal copy of the gene on one X chromosome and one haemophilia copy on the other X chromosome.

Here's a breakdown of the possible scenarios:

a) The mother must have been heterozygous: This is the correct answer because it explains why one child is haemophilic (inheriting the faulty gene from the mother) and the other child is normal (not inheriting the faulty gene from the mother).

b) The child is a monozygotic twin: This information is not relevant to determining the mother's genotype or the inheritance of haemophilia.

c) The other child is a female and the father is haemophilic: This information is also not relevant to determining the mother's genotype or the inheritance of haemophilia.

d) The haemophilic child is a male: This information is already given in the question stem and is not relevant to determining the mother's genotype.

In conclusion, the most appropriate information in this scenario is that the mother must have been heterozygous for the haemophilia gene.
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Read the following and answer the questions given below:Haemophilia is a sex linked disease which is also known as bleeder’s disease as the patient will continue to bleed even from a minor cut since he or she does not possess the natural phenomenon of blood clotting due to absence of anti-haemophilic globulin or factor VIII and plasma thromboplastin factor IX essential for it. As a result of continuous bleeding the patient may die of blood loss. Colour blindness is another type of sex linked trait in which the eye fails to distinguish red and green colours. Vision is however, not affected and the colour blind can, lead a normal life, reading, writing and driving (distinguishing traffic lights by their position).A man whose father was colourblind and mother was normal marries a woman whose father was haemophilic and mother was normal. Which of the following is true for their progenies? [Note: Percentage is from the total number of progenies.]

Read the following and answer the questions given below:Haemophilia is a sex linked disease which is also known as bleeder’s disease as the patient will continue to bleed even from a minor cut since he or she does not possess the natural phenomenon of blood clotting due to absence of anti-haemophilic globulin or factor VIII and plasma thromboplastin factor IX essential for it. As a result of continuous bleeding the patient may die of blood loss. Colour blindness is another type of sex linked trait in which the eye fails to distinguish red and green colours. Vision is however, not affected and the colour blind can, lead a normal life, reading, writing and driving (distinguishing traffic lights by their position).If a haemophilic man marries a woman whose father was haemophilic and mother was normal then which of the following holds true for their progenies?

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One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following informations is most appropriate?[1999]a)The mother must have been heterozygousb)The child is a monozygotic twinc)The other child is a female and the father is haemophilicd)The haemophilic child is a maleCorrect answer is option 'A'. Can you explain this answer?
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One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following informations is most appropriate?[1999]a)The mother must have been heterozygousb)The child is a monozygotic twinc)The other child is a female and the father is haemophilicd)The haemophilic child is a maleCorrect answer is option 'A'. 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 One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following informations is most appropriate?[1999]a)The mother must have been heterozygousb)The child is a monozygotic twinc)The other child is a female and the father is haemophilicd)The haemophilic child is a maleCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for One child is haemophilic (sex-linked trait), while its fraternal twin brother is normal. Which one of the following informations is most appropriate?[1999]a)The mother must have been heterozygousb)The child is a monozygotic twinc)The other child is a female and the father is haemophilicd)The haemophilic child is a maleCorrect answer is option 'A'. Can you explain this answer?.
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