Question

Choose the correct answers from the alternatives given.
All of the following are sexual sources of genetic variation except

• A. crossing-over
• B. mutation
• C. production of offspring from two parents
• D. random fertilization

Answer 1

The correct option is A crossing-over

Mutation, an alteration in the genetic material (the genome) of a cell of a living organism that is more or less permanent and that can be transmitted to the cell. Mutation is not a part of the sexual source. So the correct option is A, crossing over.