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AMU Medical AMU Solved Paper-1996

  • question_answer
    Recombination of the alleles of two genes A and B following crossing over will hypothetically result in four allelic recombinations. In the absence of crossing over the two parental combinations would be formed as

    A)  AB and ab type

    B)  AB and Ab type

    C)  ab and aB type

    D)  AB, ab, Ab and aB.

    Correct Answer: A

    Solution :

    : In normal conditions there are chances of crossing over and four types of gametes are formed. These gametes show linkage in 50% of the gametes and 50% of the gametes are of recombination type. Because crossing over occurs in between the two non-sister chromatids of a homologous chromosome pair only and the other two chromatids are not involved. If there is no crossing over then, only two types of gametes will be formed. So, the parental combination would be AB and ab as \[1:1\] in the absence of recombination.


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