Meiosis and Reproduction Warmup Fill in the following table. P C M M A P T N

Interphase In between P Prophase C Condense M Metaphase Middle A Stage What happens Interphase In between P Prophase C Condense M Metaphase Middle A Anaphase Pull Apart T Telophase N New Nucleus Cytokinesis Cutting

Review Mitosis Cell Cycle What is the goal of mitosis? Reproducing cells What is the goal of mitosis? To make new cells Reproduce Grow

Chromosomes in mitosis We are making an exact copy of a cell How many chromosomes before Mitosis 23 Pairs or 46 chromosomes in humans How many after Mitosis. 23 pairs or 46 chromosomes How many during mitosis

Come up with diagram Draw a cell that has 4 chromosomes Before mitosis During Mitosis After Mitosis

Reproduction Copying of cells Asexual Binary fission Only one parent Producing offspring exactly the same as parent. No variety Binary fission Bacteria Splitting similar To mitosis to make new cells.

Meiosis The process of making new sex cells. Used in Sexual Reproduction Ends up with four sex cells Half the number of chromosomes.

Sexual Reproduction Reproduction using two parents If you combine two sex cells you make a zygote. Zygote is a combination of chromosomes. forms baby with a variety of dna What happens to the number of chromosomes in the zygote?

Come up with diagram Draw a cell that has 4 chromosomes Before Meiosis During Meiosis After Meiosis

Meiosis makes 4 cells Each cell has HALF the original chromosomes.

Diagram cells How many do we start with How many chromosomes

Characteristics Mitosis Meiosis Definition of the process When the nucleus is copied The process of making 4 new sex cells with half the chromosomes as the original. Purpose of the process Asexual Reproduction; Repair/replace cells; Growth Sexual Reproduction Type of Original Cell Body Cell Reproductive Body Cell/Sex cell # of Cell Divisions 1 2 Name of Cells Produced Daughter Cells/body cells Sex Cells # of Cells Produced 4 Comparison of DNA in End Cells to Original Cell Identical Not same Comparison of Number of Chromosomes In End Cells to Original Cell Same One-Half

If I have a grasshopper with 18 chromosomes. How many does each cell have after mitosis? 18 each. How many does each cell have after meiosis 9