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Cellular Division
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Cellular Division

Cellular Division

Slide 2

Cell Division

Cell Division

All cells are derived from pre-existing cells

New cells are produced for growth and to replace damaged or old cells

Differs in prokaryotes (bacteria) and eukaryotes (protists, fungi, plants, & animals)

Slide 3

Keeping Cells Identical

Keeping Cells Identical

The instructions for making cell parts are encoded in the DNA, so each new cell must get a complete set of the DNA molecules

Slide 4

DNA Replication

DNA Replication

DNA must be copied or replicated before cell division

Each new cell will then have an identical copy of the DNA

Original DNA strand

Two new, identical DNA strands

Slide 5

Identical Daughter Cells

Identical Daughter Cells

Parent Cell

Two identical daughter cells

Slide 6

Chromosomes

Chromosomes

Slide 7

Prokaryotic Chromosome

Prokaryotic Chromosome

The DNA of prokaryotes (bacteria) is one, circular chromosome attached to the inside of the cell membrane

Slide 8

Eukaryotic Chromosomes

Eukaryotic Chromosomes

All eukaryotic cells store genetic information in chromosomes

Most eukaryotes have between 10 and 50 chromosomes in their body cells

Human body cells have 46 chromosomes or 23 identical pairs

Slide 9

Eukaryotic Chromosomes

Eukaryotic Chromosomes

Each chromosome is composed of a single, tightly coiled DNA molecule

Chromosomes cant be seen when cells arent dividing and are called chromatin

Slide 10

Compacting DNA into Chromosomes

Compacting DNA into Chromosomes

DNA is tightly coiled around proteins called histones

Slide 11

Chromosomes in Dividing Cells

Chromosomes in Dividing Cells

Duplicated chromosomes are called chromatids & are held together by the centromere

Called Sister Chromatids

Slide 12

Karyotype

Karyotype

A picture of the chromosomes from a human cell arranged in pairs by size

First 22 pairs are called autosomes

Last pair are the sex chromosomes

XX female or XY male

Slide 13

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