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Sexual vs. Asexual Reproduction. By: Brianna Shields October 19, 2004. DO NOW- Hwk on desk!. 1. Which cell part is green, found only in plants and is the site of photosynthesis? 2. Which cell part acts as the cleanup crew, recycling old cell parts?

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Sexual vs asexual reproduction

Sexual vs. Asexual Reproduction

By:

Brianna Shields

October 19, 2004


Do now hwk on desk
DO NOW- Hwk on desk!

  • 1. Which cell part is green, found only in plants and is the site of photosynthesis?

  • 2. Which cell part acts as the cleanup crew, recycling old cell parts?

  • 3. Which cell part is found in both animal and plant cells and produces the energy for the cell?


Homework
Homework

  • Please clear everything except your homework off of your desk

  • We will go over it together

  • It is your responsibility to make the corrections


Sexual vs asexual reproduction
GOAL

  • To compare forms of sexual and asexual reproduction

  • To understand the process of mitosis


Sexual reproduction

Sexual Reproduction

1. 2 parents

2. Sex cells: sperm and egg

3. Sperm and egg join= fertilization

4. Offspring look different from parent (mixed DNA)

Sexual Reproduction


Sexual reproduction1

Sexual Reproduction

5. Examples

Humans, some plants, mammals, fish, reptiles, etc.

Sexual Reproduction



Asexual reproduction

Asexual Reproduction

1. One parent

2. No sex cells

3. Offspring produced by cell division

4. Offspring identical to parent (same DNA)

5. Several types in plants and animals

Asexual Reproduction


Types of asexual reproduction

Binary Fission

1. Organism divides in half

2. 2 identical daughter cells produced

3. Daughter cells are half the parent’s size

4. Daughter cells grow, then divide too

5. In bacteria

Types of Asexual Reproduction


Types of asexual reproduction1

Budding

1. Small bud grows out of parent cell

2. Two different sized cells made (with identical DNA)

3. Bud breaks off and grows

4. In yeast and hydra

Types of Asexual Reproduction


Types of asexual reproduction2

Regeneration

1. Repair/ grow lost body parts

2. Left over cells divide to make more cells

3. Lobsters, starfish, lizards

Types of Asexual Reproduction
















Mitosis

Mitosis

1. Cell division

2. Causes multicellular organisms to grow (even in humans)

3. Cells are identical to parent cells (same DNA)

Mitosis


Mitosis1

Phase 1- Interphase

Chromosomes copied

Cell resting

Threadlike chromatin (DNA ball)

Mitosis


Mitosis2

Phase 2- Prophase

Mitosis begins

Chromosomes are rodlike pairs

Centrioles move to poles

Spindle fibers connect centrioles

Mitosis


Mitosis3

Phase 3- Metaphase

Chromosomes attach to spindle fibers

They line up in middle of cell

Mitosis


Mitosis4

Phase 4- Anaphase

Sister chromatids pull apart

One sister of each pair goes to opposite ends of the cell

Mitosis


Mitosis5

Phase 5- Telophase

2 new nuclei form

Chromosomes are in a ball again (chromatin)

Mitosis


Mitosis6

Phase 6- Cytokinesis

Cytoplasm pinches in to form 2 new identical daughter cells

Mitosis