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How dose Drosophila show complete linkag...

How dose Drosophila show complete linkage?

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C. B. Bridges discovered that crossing over is completely absent in some species of male Drosophila. Therefore they exhibit complete linkage.
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Knowledge Check

  • Assertion (A): Complete linkage is noticed in male species of Drosophila. Reason (R): Completely linked genes show some crossing over.

    A
    A is true, R is false
    B
    Both A and R are false
    C
    A is true, R is not correct explanation of A
    D
    R explains A

  • Which of the following sentences are correct? 1. The offspring exhibit only parental combinations due to incomplete linkage. 2. The linked genes exhibit some crossing over in complete linkage. 3. The separation of two linked genes are possible in incomplete linkage. 4. Crossing over is absent in complete linkage.

    A
    1 and 2
    B
    2 and 3
    C
    3 and 4
    D
    1 and 4

  • Identify the incorrect statements from the below (I) Incomplete linkage 1:1:1:1 ratio is not obtained in test cross. (II) Synaptonemal complex prevents crossing over in Drosophila. (III) Crossing over is the reason for incomplete linkage. (IV) The horizontal cut will not create recombinants according to Robin Holliday.

    A
    I, II and IV
    B
    I and IV
    C
    III and IV
    D
    I, III and IV

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