What is a three point test cross?

What is the advantage of a three point test cross?

Accurate mapping of genes can be done by three point test cross because increases

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.

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

What is homozygous tall test cross?

All test crosses are back cross. But all back crosses are not test cross'. Justify the statement.

Prove that any three points on a circle cannot be collinear.