Meiotic Division in Primary Spermocyte and Primary Oocyte:

The process of meiotic division in primary spermocyte and primary oocyte is quite different. The following are the differences between the two:

Number of Chromosomes:
- Primary spermocyte: It has 46 chromosomes in total, with 23 pairs of homologous chromosomes.
- Primary oocyte: It also has 46 chromosomes in total, with 23 pairs of homologous chromosomes.

Timing:
- Primary spermocyte: Meiotic division in primary spermocyte begins at puberty and continues throughout the life of the male.
- Primary oocyte: Meiotic division in primary oocyte begins before birth and then stops at prophase I. It resumes during puberty and stops again at metaphase II until fertilization occurs.

Resulting Cells:
- Primary spermocyte: Meiotic division in primary spermocyte results in the formation of four haploid sperm cells.
- Primary oocyte: Meiotic division in primary oocyte results in the formation of one haploid ovum and three polar bodies.

Crossover:
- Primary spermocyte: Crossover occurs during meiosis I, resulting in genetic variation among the sperm cells.
- Primary oocyte: Crossover also occurs during meiosis I, but it is asymmetrical, resulting in genetic variation only in the ovum.

Size:
- Primary spermocyte: It is smaller in size compared to the primary oocyte.
- Primary oocyte: It is larger in size compared to the primary spermocyte.

In conclusion, while both primary spermocyte and primary oocyte undergo meiotic division, there are significant differences in the number of chromosomes, timing, resulting cells, crossover, and size. These differences are essential to ensure the production of viable sperm and ova, respectively.