Question

If one follows 50 primary oocytes in an animal through their various stages of oogenesis, how many secondary oocytes would be formed? How many first polar bodies would be formed? How many ootids would be formed? If one follows 50 primary spermatocytes in an animal through their various stages of spermatogenesis, how many secondary spermatocytes would be formed? How many spermatids would be formed?

Short answer

Answer: From 50 primary oocytes, 50 secondary oocytes, 50 first polar bodies, and 50 ootids are formed. From 50 primary spermatocytes, 100 secondary spermatocytes and 200 spermatids are formed.

Step-by-step solution

Oogenesis stages and cell formation ratios

Oogenesis is the process that produces female gametes (ovum). It consists of several stages: primary oocyte, secondary oocyte, first polar body, and ootid. The important thing to note here is that from one primary oocyte, one secondary oocyte and one first polar body are formed. Eventually, one ootid is formed from the secondary oocyte.

Calculate the number of secondary oocytes

Given 50 primary oocytes, the number of secondary oocytes formed is equal to the number of primary oocytes. So, 50 secondary oocytes are formed.

Calculate the number of first polar bodies

Since one first polar body is formed for every primary oocyte, the number of first polar bodies formed is also equal to the number of primary oocytes. So, 50 first polar bodies are formed.

Calculate the number of ootids

As one ootid is formed from one secondary oocyte, the number of ootids formed is equal to the number of secondary oocytes. So, 50 ootids are formed.

Spermatogenesis stages and cell formation ratios

Spermatogenesis is the process that produces male gametes (sperm). It includes the following stages: primary spermatocyte, secondary spermatocyte, and spermatid. From one primary spermatocyte, two secondary spermatocytes are formed, and from one secondary spermatocyte, two spermatids are formed.

Calculate the number of secondary spermatocytes

Given 50 primary spermatocytes, two secondary spermatocytes are formed from each primary spermatocyte. So, 50 * 2 = 100 secondary spermatocytes are formed.

Calculate the number of spermatids

As two spermatids are formed from one secondary spermatocyte, the number of spermatids formed is twice the number of secondary spermatocytes. So, 100 * 2 = 200 spermatids are formed. From the analysis and calculations, we can conclude that from 50 primary oocytes, 50 secondary oocytes, 50 first polar bodies, and 50 ootids are formed. From 50 primary spermatocytes, 100 secondary spermatocytes and 200 spermatids are formed.