Which of the following sentences are cor...

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.

1 and 2

2 and 3

3 and 4

1 and 4

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Which of the following sentences are correct? (I) Gibberellins play a role in sex determination in maize. (II) Multiple alleles determine self sterility in Nicotiana. (III) Crossing over leads to non-separation of linked genes. (IV) In incomplete linkage, crossing over is observed.

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

Choose the correct statement(s). (I) Incomplete linkage 1:1:1:1 ratio is not obtained in test cross. (II) Synaptonemal complex prevents crossing over in Drosopilla (III) The horizontal cut will not create recombinants according to Robin Holliday. (IV) crossing over is the reason for incomplete linkage

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Depending upon the distance between any two genes which is inversely proportional to the strength of linkage, cross overs will vary from

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