Sex-Linked Inheritance Overview
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Sex-Linked Inheritance Overview

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Questions and Answers

What is the term for the inability to see red color due to a hereditary condition?

  • Tritanopia
  • Protonopia (correct)
  • Hemizygosity
  • Deuteronopia

    • How are the genes for color blindness inherited in males?

  • Only from the father.
  • Only from the mother. (correct)
  • They are inherited from both parents.
  • There is no inheritance pattern.

    • What genetic representation indicates a normal person's genes concerning color blindness?

  • Cc (correct)
  • CC (correct)
  • cc
  • C and cc

    • What is the term used for a daughter who carries the recessive gene for color blindness but does not express the disease?

    <p>Normal carrier</p> Signup and view all the answers

    Which of the following statements about color blindness inheritance is true?

    <p>Sons inherit color blindness from their mothers.</p> Signup and view all the answers

    What is the term used for the genes controlling body characters located on the sex chromosomes?

    <p>Sex-linked genes</p> Signup and view all the answers

    Which inheritance pattern is commonly associated with sex-linked traits?

    <p>Criss-cross inheritance</p> Signup and view all the answers

    Which of the following is NOT an example of sex-linked inheritance?

    <p>Skin color</p> Signup and view all the answers

    Which chromosome is primarily associated with X-linked inheritance?

    <p>X chromosome</p> Signup and view all the answers

    What is the characteristic of most sex-linked traits?

    <p>They are usually recessive.</p> Signup and view all the answers

    The term 'XY-linked genes' refers to genes located on which chromosomes?

    <p>Both X and Y chromosomes</p> Signup and view all the answers

    Which condition is an example of a Y-linked trait?

    <p>Hypertrichosis</p> Signup and view all the answers

    Who discovered the concept of sex-linked inheritance?

    <p>Thomas Hunt Morgan</p> Signup and view all the answers

    What is the genetic basis for the inheritance of color blindness from a colorblind father?

    <p>Sons inherit the X chromosome from their mother, leading to color blindness.</p> Signup and view all the answers

    What is a characteristic symptom of hemophilia?

    <p>Delayed blood clotting.</p> Signup and view all the answers

    How do colorblind grandsons appear when daughters (carriers) marry colorblind men?

    <p>All grandsons will be colorblind.</p> Signup and view all the answers

    What role does antihaemophilic globulin play in normal blood clotting?

    <p>It facilitates rapid clotting in blood.</p> Signup and view all the answers

    What percentage of a color blind father's sons will be color blind?

    <p>All of the sons.</p> Signup and view all the answers

    What happens when a colorblind woman has children with a normal vision man?

    <p>All sons will be colorblind if they inherit the X chromosome from their mother.</p> Signup and view all the answers

    What does criss-cross inheritance imply in the context of color blindness?

    <p>Sons can inherit a trait from their mother, while daughters inherit from their father.</p> Signup and view all the answers

    What is the typical delay in blood clotting for hemophilic patients?

    <p>Clotting takes between 20 minutes to 24 hours.</p> Signup and view all the answers

    What is the other name for haemophilia?

    <p>Royal disease</p> Signup and view all the answers

    Which chromosomes carry the genes for haemophilia?

    <p>Only the X chromosome</p> Signup and view all the answers

    In the inheritance of haemophilia, who transmits the condition from the father to his grandson?

    <p>Daughters of the haemophilic man</p> Signup and view all the answers

    What type of genetic character does haemophilia represent?

    <p>Recessive character</p> Signup and view all the answers

    What is the male condition for haemophilia based on the gene representation?

    <p>XhY</p> Signup and view all the answers

    Why do haemophilic patients often not reach reproductive age?

    <p>Severe bleeding can result in early death</p> Signup and view all the answers

    What percentage of sons would be haemophilic if the carrier daughter marries a normal man?

    <p>50%</p> Signup and view all the answers

    Why is haemophilia more common in men than in women?

    <p>Males have only one X chromosome</p> Signup and view all the answers

    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.
    • 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.
    • 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.
    • 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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    Sex Linked Inheritance PDF

    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.

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