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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • Which of the following phenomena exhibits criss-cross inheritance?

    Question: Which of the following phenomena exhibits criss-cross inheritance?

    Options:

    Sex-influenced character
    Polygamy
    Sex-linked character
    Sex-quantitative character

    ✅Explanation:
    Criss-cross inheritance, also called X-linked inheritance, occurs when a recessive trait carried on the X chromosome is expressed in males who only have one X chromosome (inherited from their mother) but not in females who have two X chromosomes (one from each parent). This happens because females have a second X chromosome that can potentially carry a dominant allele, masking the recessive trait.

    • Explanation of 📌Other Options:
    ● a) Sex-influenced character: These are traits influenced by sex hormones but are not directly linked to the sex chromosomes and don't exhibit criss-cross inheritance. For example, pattern baldness in males is influenced by testosterone but not solely determined by X chromosome genes.
    ● b) Polygamy: This is a mating system where an individual has multiple partners, not an inheritance pattern.
    ● d) Sex-quantitative character: These are traits influenced by both sex and multiple genes across different chromosomes, not solely by the X chromosome, and don't exhibit criss-cross inheritance. For example, height is influenced by sex and several genes, not just one on the X chromosome.

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