Part A: If one follows 70 primary oocytes in an animal through their various stages of oogenesis, how many secondary oocytes would be formed?

Part B:How many first polar bodies would be formed?

Part C: How many ootids would be formed?

Part A : 70 secondary oocytes will be formed.

Part B : 70 first polar bodies will be formed.

Part C : 70 ootids will be formed.

Explanation:

During oogenesis growth maturation of a single oogonium produces one primary oogonium.

the primary oogonium then undergoes meiosis - 1 and produces one secondary oocyte and first polar body.

The secondary oocyte then undergoes meiosis - 2 and forms an ootid and second polar body.

The ootid then differentiates into the ovum.

As in the above scenario, 70 primary oocytes are present, they undergo meiosis-1 and produces 70 secondary oocytes and 70 first polar bodies. Hence answers of part A and B is 70.

As 70 secondary oocytes are formed, they undergo meiosis - 2 and forms 70 ootids which then differentiate in 70 ovums.