IB Biology Topic B2.3.1: Production of Unspecialized Cells Following Fertilization and Their Development Notes

One Zygote Divides Into Many Identical Cells That Then Specialise

At fertilisation a sperm cell fuses with an egg cell to form a single zygote that carries the full genome of the new organism.

The zygote divides many times by mitosis, producing many genetically identical unspecialised cells.

These early cells can still give rise to many different cell types, then progressively commit as development continues.

Each unspecialised cell then differentiates into a specialised cell suited to a particular job.

Analogy

Every cell holds the same library of songs, which is the genome.
Each cell type plays a different playlist by expressing a different subset of those genes.

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

IB Biology Topic B2.3.1: Production of Unspecialized Cells Following Fertilization and Their Development Notes

One Zygote Divides Into Many Identical Cells That Then Specialise

Differentiation: Same Genome, Different Genes Switched On

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Excepteur sint occaecat cupidatat non proident

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One Zygote Divides Into Many Identical Cells That Then Specialise

Differentiation: Same Genome, Different Genes Switched On

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B2.3.1: Production of Unspecialized Cells Following Fertilization and Their Development Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

One Zygote Divides Into Many Identical Cells That Then Specialise

Differentiation: Same Genome, Different Genes Switched On

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

One Zygote Divides Into Many Identical Cells That Then Specialise

Differentiation: Same Genome, Different Genes Switched On

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account