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Related Concept Videos

Synthetic Biology02:55

Synthetic Biology

5.8K
Synthetic biology is an interdisciplinary science that involves using principles from disciplines such as engineering, molecular biology, cell biology, and systems biology. It involves remodeling existing organisms from nature or constructing completely new synthetic organisms for applications such as protein or enzyme production, bioremediation, value-added macromolecule production, and the addition of desirable traits to crops, to name a few.
Golden rice
Golden rice is a genetically modified...
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Meiosis I01:49

Meiosis I

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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Meiosis II01:57

Meiosis II

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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Meiosis II02:02

Meiosis II

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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Crossing Over01:34

Crossing Over

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
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Crossing Over01:30

Crossing Over

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Updated: Mar 22, 2026

Application of Mouse Parthenogenetic Haploid Embryonic Stem Cells as a Substitute of Sperm
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Representative Aspects of Some Synthetic Gametes.

Calum MacKellar

    The New Bioethics : a Multidisciplinary Journal of Biotechnology and the Body
    |April 30, 2016
    PubMed
    Summary

    Synthetic gametes challenge our understanding of human reproduction. This study explores viewing gametes as representations of their originating persons, with implications for relational identity and synthetic gamete ethics.

    Area of Science:

    • Reproductive Biology
    • Bioethics
    • Philosophy of Identity

    Background:

    • Advancements in synthetic gamete production necessitate re-evaluating reproductive cell concepts.
    • Current understanding of gametes is primarily biological, lacking deeper philosophical or ethical integration.
    • The origin and representation of gametes in human procreation require renewed examination.

    Purpose of the Study:

    • To explore the concept of gametes as direct representations of the individuals from whom they originate.
    • To analyze the ethical considerations surrounding synthetic gametes from the perspective of relational identity.
    • To re-examine the understanding of reproductive cells in light of emerging biotechnologies.

    Main Methods:

    • Philosophical inquiry into the nature of representation and identity.

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  • Ethical analysis of synthetic gamete use.
  • Conceptual examination of gametes as extensions of the originating person.

    • Main Results:

    • Proposes that sperm and egg cells can be conceptually understood as representing the man and woman, respectively.
    • Identifies potential ethical conflicts arising from synthetic gametes and relational identity.
    • Highlights the need for a nuanced understanding of gamete origin and representation.

    Conclusions:

    • Viewing gametes as representations of originating persons offers a new ethical framework.
    • Synthetic gametes raise profound questions about identity, procreation, and personhood.
    • Further ethical deliberation is crucial as synthetic gamete technology advances.