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5 November, 05:18

Which of these hypothetical scenarios are examples of pleiotropy? select all that apply?

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  1. 5 November, 05:44
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    I found the options to the exercise on the internet. Here are they:

    "A. A defect in a single gene causes a disease in which affected individuals have longer limbs.

    B. A defect in a single gene causes a disease in which affected individuals have longer limbs and vision problems.

    C. A single gene determines whether or not an individual is colour blind.

    D. A single gene determines the hair and eye colour of an individual.

    E. Multiple genes determine the height of an individual."

    The scenario B is the one that best describes a pleiotropy. Pleiotropy is the phenomenon that is present when a single gene influences the phenotype of two or more different traits that have no direct relation. A and C scenarios are one gene-one characteristic. E scenario is multiple genes-multiple characteristics. D scenario although it shows a gene being related with two different "organs", both traits are easy to relate as the base of it is coloured pigmentation in cells.
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