Answer Generally chromosome reduction occurs during formation of gametes. The gametes are haploid as they are produced from diploid parent by meiosis. If the reduction doesn\'t occur, the ploidy of organism that is produced by sexually reproduction will be increased. The ploidy may be come tetraploid or hexaploid or polyploid. These polyploid organisms are mostly sterile. Ex. The gametes produced from diploid parents are also diploid due to the absence of reduction. If the two diploid gametes fuse, it develops into tetraploid organism. It may or may not alive. Even if it is alive, the tetraploid organism will be sterile. Solution Answer Generally chromosome reduction occurs during formation of gametes. The gametes are haploid as they are produced from diploid parent by meiosis. If the reduction doesn\'t occur, the ploidy of organism that is produced by sexually reproduction will be increased. The ploidy may be come tetraploid or hexaploid or polyploid. These polyploid organisms are mostly sterile. Ex. The gametes produced from diploid parents are also diploid due to the absence of reduction. If the two diploid gametes fuse, it develops into tetraploid organism. It may or may not alive. Even if it is alive, the tetraploid organism will be sterile..