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Related Concept Videos

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...
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...
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Regression Toward the Mean01:52

Regression Toward the Mean

Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when researchers try to extrapolate results...
Gonadal and Placental Hormones01:24

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...

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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

Fertility differences in Peru: A reconsideration.

B S Bradshaw

    Population Studies
    |November 15, 2011
    PubMed
    Summary

    Studies in Peru, Bolivia, and Ecuador found lower fertility rates in predominantly Indigenous areas compared to economically developed Spanish-speaking regions. This suggests socioeconomic factors may influence population dynamics.

    Area of Science:

    • Demography
    • Sociology
    • Anthropology

    Background:

    • Previous research by Stycos, Heer, and James indicated variations in fertility levels across different regions.
    • Socioeconomic development and ethnic composition were noted as potential influencing factors.

    Purpose of the Study:

    • To investigate the relationship between socioeconomic development and fertility rates in predominantly Indigenous and Spanish-speaking areas.
    • To analyze demographic patterns in Peru, Bolivia, and Ecuador.

    Main Methods:

    • Comparative analysis of fertility data from different regions.
    • Review of existing literature and reported findings.

    Main Results:

    • Predominantly Indigenous areas in Peru exhibited significantly lower fertility rates than economically developed Spanish-speaking areas.

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    Sperm Collection of Differential Quality Using Density Gradient Centrifugation
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    Sperm Collection of Differential Quality Using Density Gradient Centrifugation

    Published on: November 29, 2018

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    Last 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

    Sperm Collection of Differential Quality Using Density Gradient Centrifugation
    03:28

    Sperm Collection of Differential Quality Using Density Gradient Centrifugation

    Published on: November 29, 2018

  • Similar trends of lower fertility in Indigenous regions were observed in Bolivia and Ecuador.

    • Conclusions:

    • Socioeconomic factors appear to play a significant role in observed fertility differentials.
    • Further research is warranted to explore the complex interplay of ethnicity, economics, and fertility in these South American nations.