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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 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? • 3. Which cell part is found in both animal and plant cells and produces the energy for the cell?
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
GOAL • To compare forms of sexual and asexual reproduction • To understand the process of mitosis
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 Reproduction 5. Examples Humans, some plants, mammals, fish, reptiles, etc. Sexual 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
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
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
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 1. Cell division 2. Causes multicellular organisms to grow (even in humans) 3. Cells are identical to parent cells (same DNA) Mitosis
Phase 1- Interphase Chromosomes copied Cell resting Threadlike chromatin (DNA ball) Mitosis
Phase 2- Prophase Mitosis begins Chromosomes are rodlike pairs Centrioles move to poles Spindle fibers connect centrioles Mitosis
Phase 3- Metaphase Chromosomes attach to spindle fibers They line up in middle of cell Mitosis
Phase 4- Anaphase Sister chromatids pull apart One sister of each pair goes to opposite ends of the cell Mitosis
Phase 5- Telophase 2 new nuclei form Chromosomes are in a ball again (chromatin) Mitosis
Phase 6- Cytokinesis Cytoplasm pinches in to form 2 new identical daughter cells Mitosis
Which phase of mitosis is this? Explain….. Cytokinesis
Which phase of mitosis is this? Explain….. Interphase
