Question

why an equal division of cytoplasm occures
during the formation of ovum

Answer 1

The equal distribution of cytoplam occurs through a process called cleavage which occurs in cytokinesis and divides the cytoplasm equally to form two or more daughter cells. Ovum formation is followed by this process as it helps to reproduce and cintinue tjeir generation.

Answer 2

Oogenesis occurs within the
follicles of the ovaries. The meiosis of oocytes always results in halpoid
cells of unequal size. When a primary oocyte undergoes meiosis, a large
halpoid secondary oocyte and a very small first polar body result. A second
meiotic division produces a large ootid and a very small second polar body.
The first polar body may or may not divide during the second meiotic
division into two additional second polar bodies. All the polar bodies are
non-functional. After meiosis, the ootid quickly differentiates into the
mature egg cell or ovum. The unequal cytokinesis that occurs has the
advantage of providing the ovum with a much greater amount of cytoplasm and
stored food than if an equal division were to occur. Thus, the non-motile
ovum supplies a developing embryo with most of its cytoplasm and food while
the much smaller but highly-motile sperm contributes mainly genetic
material to the embryo.