Drawings illustrating cross over during meiosis in the female

1 Before cross over

2 During Cross Over

3 After Cross Over

 

 

Drawings illustrating cross over during meiosis in the male

1 Before Cross Over

2 During Cross Over

3 After cross over

Another important point illustrated by these drawings is that no sperm or egg cell is similar. Due to the process called "cross over" or " crossing over of chromosomal material" each sperm and ovum ( egg cell) are unique. That is why sibling's genetic material differ, except when they are identical twins. "Cross Over" also constantly changes the genetic pool or genetic data contained within in a specific species. The only chromosome that stays shows little change with passing generations is the Y chromosome. Is is difficult to exchange material with it's large X chromosome partner.

Human males thus contains less genetic material than females. Thus should prove that it is not the amount (quantity) but the quality of the genetic material that is important. Both sexes of the species Homo sapiens have similar mental capabilities.