If the cell cycle is not completed properly

Improper separation during anaphase results in a cell that has an abnormal number of chromosomes. Anaphase is part of mitosis, or the process of cell division. Anaphase is the time during which chromosomes that are lined up in the middle of a cell are pulled apart in two directions, resulting in two new cells. Errors during anaphase can result in the usual two cells after mitosis or one big cell because the two cells never split apart. In either case, the number of chromosomes is often wrong. There are different types of chromosomal abnormalities, ranging from one extra copy of one chromosome to multiple extra copies of all chromosomes.

Correlation is a mutual relationship or connection between two or more things. In our example a correlation of +0.80 between height and weight for adults means. A) 80%. The correlation measures the extent to which knowing the value of height helps you to predict the value of weight. Even with a high correlation of +0.80, we cannot really expect two persons with exactly the same height to have exactly the same weight. Almost always there is some difference.  What this says is that, as height goes higher, the weight goes higher, too.