Related Experiment Video

Updated: May 27, 2026

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization
06:40

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Published on: October 24, 2025

Changes in childlessness for all women in the United States: A reply to Spencer

G F De Jong, R R Sell

    Population Studies
    |November 19, 2011
    PubMed

    Abstract The analysis of changes in childlessness as opposed to structural correlates of childlessness is quite new. Our focus on indicators of such changes called for a macro-analytic framework which would permit the test of changing features of population characteristics and the relationship between structural changes in different population cohorts. An appropriate data set was one that would permit the analysis ofchanging levels ofchildlessness in age cohorts and the changes in population characteristics which would offer possible explanations for the changing childlessness pattern.

    More Related Videos

    Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation05:42

    Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation

    Published on: October 25, 2024

    A Novel Method for Involving Women of Color at High Risk for Preterm Birth in Research Priority Setting14:43

    A Novel Method for Involving Women of Color at High Risk for Preterm Birth in Research Priority Setting

    Published on: January 12, 2018

    Related Concept Videos

    Infertility in Females01:28

    Infertility in Females

    Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
    Endometriosis, a condition characterized by abnormal growth of endometrial...
    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.
    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...
    Close Relationships and Culture01:29

    Close Relationships and Culture

    Culture shapes how people approach attraction, choose partners, and build long-term relationships. While some preferences in mate selection appear consistent across cultures, such as men valuing physical attractiveness and women emphasizing financial resources, cultural contexts influence how these preferences are expressed and prioritized. Marriage extends beyond romantic ideals in many societies and is deeply embedded in social, economic, and religious frameworks.The Role of Culture in Mate...
    Life Histories01:29

    Life Histories

    Overview