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Related Concept Videos

Reproductive Cloning01:27

Reproductive Cloning

Reproductive cloning is the process of producing a genetically identical copy—a clone—of an entire organism. While clones can be produced by splitting an early embryo—similar to what happens naturally with identical twins—cloning of adult animals is usually done by a process called somatic cell nuclear transfer (SCNT).
Somatic Cell Nuclear Transfer
In SCNT, an egg cell is taken from an animal and its nucleus is removed, creating an enucleated egg. Then a somatic cell—any cell that is not a sex...
Reproductive Cloning01:27

Reproductive Cloning

Reproductive cloning is the process of producing a genetically identical copy—a clone—of an entire organism. While clones can be produced by splitting an early embryo—similar to what happens naturally with identical twins—cloning of adult animals is usually done by a process called somatic cell nuclear transfer (SCNT).
Somatic Cell Nuclear Transfer
In SCNT, an egg cell is taken from an animal and its nucleus is removed, creating an enucleated egg. Then a somatic cell—any cell that is not a sex...
Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Infertility in Males01:23

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
Nondisjunction01:21

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
Nondisjunction01:29

Nondisjunction

During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.

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Related Experiment Video

Updated: Jun 13, 2026

Orthotopic Ovarian Transplantation Procedures to Investigate the Life- and Health-span Influence of Ovarian Senescence in Female Mice
06:49

Orthotopic Ovarian Transplantation Procedures to Investigate the Life- and Health-span Influence of Ovarian Senescence in Female Mice

Published on: February 12, 2018

Third party reproduction and the aging couple.

Janelle Luk1, Dorothy A Greenfeld, Emre Seli

  • 1Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT 06520-8063, USA.

Maturitas
|May 11, 2010
PubMed
Summary

As women age, fertility declines. Oocyte donation offers a successful option for older women seeking pregnancy, requiring thorough screening and understanding from all involved parties.

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Area of Science:

  • Reproductive Medicine
  • Human Reproduction
  • Infertility Treatment

Background:

  • Increasing average age of childbearing in industrialized nations.
  • Declining female fertility and ART success rates with advanced maternal age.
  • Growing demand for assisted reproductive options for older women.

Purpose of the Study:

  • To describe third-party reproduction, specifically oocyte donation, as a viable option for achieving pregnancy in aging women.
  • To highlight the critical need for comprehensive medical and psychological screening of all participants.
  • To emphasize the importance of a thorough understanding of the oocyte donation process for all parties involved.

Main Methods:

  • Review of oocyte donation as a third-party reproduction method.
  • Discussion of screening protocols for donors and recipients.
  • Explanation of the process and its requirements.

Main Results:

  • Oocyte donation demonstrates significant success rates for achieving pregnancy in older women.
  • Extensive medical and psychological screening is crucial for participant safety and process success.
  • Informed consent and understanding are vital for all individuals involved in the process.

Conclusions:

  • Oocyte donation provides a successful pathway for aging individuals and couples to achieve pregnancy.
  • The process necessitates rigorous screening and comprehensive understanding among donors, recipients, and healthcare professionals.
  • Despite its demanding nature, oocyte donation often results in a gratifying experience for all participants.