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Questions and Answers
What is the term for the inability to see red color due to a hereditary condition?
What is the term for the inability to see red color due to a hereditary condition?
How are the genes for color blindness inherited in males?
How are the genes for color blindness inherited in males?
What genetic representation indicates a normal person's genes concerning color blindness?
What genetic representation indicates a normal person's genes concerning color blindness?
What is the term used for a daughter who carries the recessive gene for color blindness but does not express the disease?
What is the term used for a daughter who carries the recessive gene for color blindness but does not express the disease?
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Which of the following statements about color blindness inheritance is true?
Which of the following statements about color blindness inheritance is true?
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What is the term used for the genes controlling body characters located on the sex chromosomes?
What is the term used for the genes controlling body characters located on the sex chromosomes?
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Which inheritance pattern is commonly associated with sex-linked traits?
Which inheritance pattern is commonly associated with sex-linked traits?
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Which of the following is NOT an example of sex-linked inheritance?
Which of the following is NOT an example of sex-linked inheritance?
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Which chromosome is primarily associated with X-linked inheritance?
Which chromosome is primarily associated with X-linked inheritance?
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What is the characteristic of most sex-linked traits?
What is the characteristic of most sex-linked traits?
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The term 'XY-linked genes' refers to genes located on which chromosomes?
The term 'XY-linked genes' refers to genes located on which chromosomes?
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Which condition is an example of a Y-linked trait?
Which condition is an example of a Y-linked trait?
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Who discovered the concept of sex-linked inheritance?
Who discovered the concept of sex-linked inheritance?
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What is the genetic basis for the inheritance of color blindness from a colorblind father?
What is the genetic basis for the inheritance of color blindness from a colorblind father?
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What is a characteristic symptom of hemophilia?
What is a characteristic symptom of hemophilia?
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How do colorblind grandsons appear when daughters (carriers) marry colorblind men?
How do colorblind grandsons appear when daughters (carriers) marry colorblind men?
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What role does antihaemophilic globulin play in normal blood clotting?
What role does antihaemophilic globulin play in normal blood clotting?
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What percentage of a color blind father's sons will be color blind?
What percentage of a color blind father's sons will be color blind?
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What happens when a colorblind woman has children with a normal vision man?
What happens when a colorblind woman has children with a normal vision man?
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What does criss-cross inheritance imply in the context of color blindness?
What does criss-cross inheritance imply in the context of color blindness?
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What is the typical delay in blood clotting for hemophilic patients?
What is the typical delay in blood clotting for hemophilic patients?
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What is the other name for haemophilia?
What is the other name for haemophilia?
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Which chromosomes carry the genes for haemophilia?
Which chromosomes carry the genes for haemophilia?
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In the inheritance of haemophilia, who transmits the condition from the father to his grandson?
In the inheritance of haemophilia, who transmits the condition from the father to his grandson?
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What type of genetic character does haemophilia represent?
What type of genetic character does haemophilia represent?
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What is the male condition for haemophilia based on the gene representation?
What is the male condition for haemophilia based on the gene representation?
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Why do haemophilic patients often not reach reproductive age?
Why do haemophilic patients often not reach reproductive age?
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What percentage of sons would be haemophilic if the carrier daughter marries a normal man?
What percentage of sons would be haemophilic if the carrier daughter marries a normal man?
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Why is haemophilia more common in men than in women?
Why is haemophilia more common in men than in women?
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Study Notes
Sex-Linked Inheritance
- Sex-linked inheritance refers to the transmission of traits from parents to offspring, involving genes located on sex chromosomes.
- Sex-linked genes are genes located on the sex chromosomes (X or Y).
- Sex-linked characters are traits controlled by genes found on the sex chromosomes.
- X-linked genes are located on the X chromosome. Inheritance of these genes is called X-linked inheritance.
- Y-linked genes are located on the Y chromosome. Inheritance of these genes is called Y-linked inheritance.
- XY-linked genes are located on both the X and Y chromosomes. Inheritance of these genes is called XY-linked inheritance.
- Most sex-linked characters are recessive, meaning they are more common in males than in females.
- Criss-cross inheritance describes the transmission of a trait from father to grandson through his daughter.
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Colour blindness is a sex-linked recessive character.
- It is a hereditary disease where individuals can't distinguish between red and green colours.
- Protonopia refers to red blindness whereas deuteronopia is green blindness.
- The gene for colour blindness is located on the X chromosome, and the Y chromosome doesn't carry its allele.
- Colour blindness is common in males, and rare in females.
- Colour blindness follows criss-cross inheritance.
- Carriers are female individuals who possess one recessive gene for colour blindness and are phenotypically normal.
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Haemophilia (Bleeder's disease)
- A hereditary blood disease characterized by delayed blood clotting.
- It results from the absence of antihemophilic globulin, an important clotting factor in the blood.
- Haemophilia is a sex-linked recessive character.
- The gene for haemophilia is located on the X chromosome, and the Y chromosome doesn't carry its allele.
- Haemophilia is common in males, rare in females, and it also exhibits criss-cross inheritance.
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Examples of Sex-Linked Characters:
- Colour blindness
- Haemophilia
- Eye colour in Drosophila
- Hypertrichosis (hair on the pinna)
- Ichthyosis hystrix (scales on the body)
- Aeroderma pigmentosum
- Retinitis pigmentosa
- Nephritis
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Description
This quiz explores the fundamental concepts of sex-linked inheritance, including X-linked and Y-linked genes. It examines how traits are transmitted through sex chromosomes and discusses specific examples like color blindness. Test your understanding of how these genetic principles apply to real-life scenarios.
