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Secondary oocyte


noun, plural: secondary oocytes

The resulting oocyte when meiosis I is completed, and gives rise to ootid and ovum (egg cell) upon the completion of meiosis II.


In humans, the secondary oocytes are produced when the primary oocytes complete meiosis I. The second phase of meiosis (meiosis II) follows through but only partially. The secondary oocytes will be halted at the stage of metaphase II of meiosis II until fertilization takes place. Thus, when a sperm cell fertilizes the female sex cell the secondary oocyte rapidly completes the remaining stages of meiosis II, giving rise to an ootid and an ovum, which the sperm cell unites with.

See also: primary oocyte

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Human Pathology 'Multiple-Choice Questions'

... levels. 8. Which of the following induces meiotic progress of a primary oocyte to a secondary oocyte? a. The estradiol surge during the second half of the follicular phase b. ...

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by ScrimmSphere
Mon Feb 04, 2013 11:03 am
Forum: Human Biology
Topic: Human Pathology 'Multiple-Choice Questions'
Replies: 1
Views: 4869


... do as microtubule organizing centres? Also in a human ovum (secondary oocyte) a pair of centrioles is absent. This does not seem to confer a selective disadvantage ...

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by Adz795
Mon Sep 05, 2011 2:18 pm
Forum: Cell Biology
Topic: Centrosome
Replies: 2
Views: 4579


Why does meiosis II in secondary oocyte arrests in metaphase ?

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by nimisha
Thu Feb 24, 2011 6:10 am
Forum: General Discussion
Topic: zoology
Replies: 1
Views: 1447

Re: Reproduction

... produces four speratids (whereas one oogonia produces only one secondary oocytes)... Female gamete production starts also starts at puberty but the numbers of primordial ...

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by Revenged
Wed Mar 28, 2007 11:51 am
Forum: Genetics
Topic: Reproduction
Replies: 4
Views: 3267


... fertilization you even dont' have socond polar body. In fallopian tube oocyte is fertilized by sperm. During the fertilization, receprors on the envelpoe of secondary oocyte gets signal from sperm. This signal gives rise to increase in level of ...

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by konrad
Thu Feb 16, 2006 10:18 am
Forum: Human Biology
Topic: Fertilization
Replies: 3
Views: 2232

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