Asexual Reproduction 1 Cell Division Amoebas Asexual Reproduction

Asexual Reproduction

1. Cell Division - Amoebas • Asexual Reproduction – Mitosis • Amoeba – unicellular protozoan • Every three days grows large enough to divide • No shape – to star shape – to long and thin shape – to two no shape cells

Amoebas

2. Budding • Asexual Reproduction • Occurs in yeast cells • Mitosis, yet instead of cell dividing, new nucleus goes into a bulge (bud) • Sometimes bud may break off, but usually continues budding process and forms a long chain of yeast cells

Budding Yeast Cells

3. Regeneration • Regeneration – asexual reproduction by the process of regrowing missing body parts • Example: Planarian (flat worm)…cut into pieces and each piece will grow missing parts until it becomes a whole planarian. • Regeneration – can be repair or replacement vs reproduction – Example: deer growing new antlers or a lizard growing a new tail

Planarian

Splitting Planarian

4. Spores • Spore – a cell surrounded by a protective covering • Asexual reproduction - one cell can produce many spores and each can grow into a new organism • Protective covering helps them live in unfavorable conditions • Example: bread mold

Bread Mold Spores

5. Mitosis vs. Meiosis • A. Mitosis- one organism - cell duplicates genes – cell divides – asexual reproduction • B. Meiosis – two organisms - each gives a complete copy of genes to form a new organism – sexual reproduction