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Embryonic Development

Short answer: Embryonic development begins with a zygote, a single fertilized cell, which divides rapidly in a process called cleavage. In mammals the cells form a blastocyst that implants in the uterus.

Cells then differentiate into tissues and organs, the basic body plan is laid down, and the nervous system, heart and limbs form under tight genetic control. The footage shows microscope views of a dividing embryo.

VideoWrite-up2 sources

In collections:Inside the Body

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What should you know about Embryonic Development?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. Development starts with a zygote.

    DD-333-F01 · Write-up · Exhibit A (Zygote)

  2. Rapid divisions are called cleavage.

    DD-333-F02 · Write-up · Exhibit B (Cleavage)

Video transcript: Embryonic Development: Every Embryo Starts as a Single Fertilized Cell

Embryonic development begins with a single fertilized cell called a zygote. This cell undergoes rapid division through a process known as cleavage, creating a cluster of cells. These cells continue to multiply and eventually form a blastocyst, which implants in the uterus. From there, differentiation starts. Cells begin specializing into various tissues and organs through a tightly regulated process. As development continues, the basic body plan is established, with the formation of the nervous system, heart, limbs, and other vital structures. The complexity of development, driven by genetic and molecular signals, ultimately leads to the formation of a fully formed [...]. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 34.1s Reel ·

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The write-up

Every embryo starts as a single fertilized cell. Rapid divisions called cleavage come first.

  1. Exhibit A

    Zygote

    Development starts with a zygote.

  2. Exhibit B

    Cleavage

    Rapid divisions are called cleavage.

  3. Exhibit C

    Blastocyst

    Mammal embryos form a blastocyst.

  4. Exhibit D

    Differentiation

    Cells specialize.

  5. Exhibit E

    Body plan

    The body plan forms.

Questions people ask about Embryonic Development

What is the first cell?

Fertilized.

Source: Write-up · Exhibit A (Zygote) · Wikipedia: Embryonic development

What are early divisions called?

Rapid.

Source: Write-up · Exhibit B (Cleavage) · Wikipedia: Cleavage (embryo)

What implants in the uterus?

In mammals.

Source: Write-up · Exhibit C (Blastocyst) · Wikipedia: Embryonic development

What is cell specialization called?

Into tissues.

Source: Write-up · Exhibit D (Differentiation) · Wikipedia: Embryonic development

What controls development?

Tightly regulated.

Source: Write-up · Exhibit E (Body plan) · Wikipedia: Embryonic development

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. What is the first cell?

    1. A zygote
    2. A neuron
    3. A blastocyst
    4. A gamete
    Show the answer

    Answer: A. A zygote Fertilized. Source: Write-up · Exhibit A (Zygote) · Wikipedia: Embryonic development

  2. What are early divisions called?

    1. Cleavage
    2. Mitosis only
    3. Meiosis
    4. Fusion
    Show the answer

    Answer: A. Cleavage Rapid. Source: Write-up · Exhibit B (Cleavage) · Wikipedia: Cleavage (embryo)

  3. What implants in the uterus?

    1. The blastocyst
    2. The zygote
    3. The placenta
    4. The heart
    Show the answer

    Answer: A. The blastocyst In mammals. Source: Write-up · Exhibit C (Blastocyst) · Wikipedia: Embryonic development

  4. What is cell specialization called?

    1. Differentiation
    2. Mutation
    3. Digestion
    4. Migration
    Show the answer

    Answer: A. Differentiation Into tissues. Source: Write-up · Exhibit D (Differentiation) · Wikipedia: Embryonic development

  5. What controls development?

    1. Genetic signals
    2. Weather
    3. Luck
    4. Light
    Show the answer

    Answer: A. Genetic signals Tightly regulated. Source: Write-up · Exhibit E (Body plan) · Wikipedia: Embryonic development

Cite this case file

Easterling, Marcus. "Embryonic Development." The Detail Department (DetailEnjoyer), case file DD-333, last updated Sep 29, 2024. https://detailenjoyer.com/case/embryonic-development/

Permalink: https://detailenjoyer.com/case/embryonic-development/ · Last updated

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Cite a single fact by its ID, for example DD-333-F01 → https://detailenjoyer.com/case/embryonic-development/#DD-333-F01

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