Do Now: Take out notebook and pencil Explain how our bodies break down molecules and form new ones. Include which molecules we break down and which ones we form

Cell Reproduction Engage Video

Reproduction Explore Activity Follow the Explore It! Card in order Use the 3 organisms card sheet to answer the questions

Glue notes page on to page

Chromosomes- thread like molecules that carry DNA Genes- made of DNA, each person has 2 copies of each gene, one from each parent DNA- deoxyribonucleic acid, contains instructions organisms need to develop and reproduce Chromosomes- thread like molecules that carry DNA

Asexual Reproduction- offspring arise from a single organism, done through mitosis Genes inherited from only one parent, so offspring is genetically identical to the parent

Types of Asexual Reproduction Binary Fission- single celled organisms, parent cell splits into 2 halves making 2 new cells Budding- offspring grows out of the body of the parent

Types of Asexual Reproduction Fragmentation- parent body breaks into pieces and each piece can then produce offspring Regeneration- a piece of parent body is detached and then grows into completely new offspring

Advantages Disadvantages Good for non-mobile organisms, numerous offspring with little energy spent, quick Disadvantages No variation in genetics, weaknesses of parents shared, hard to adapt to environment changes

Sexual Reproduction Offspring arise from two parents, need sperm from male father and an ovum from female mother These cells form from meiosis, each cell contains 23 pairs of chromosomes Offspring appearance varies because of the pairing of chromosomes from both parents

Advantages of Sexual Reproduction Genetic variation so easy to adapt to environment More protected from parent weaknesses, bad genes removed Disadvantages of Sexual Reproduction Must find mate, process takes longer, fewer offspring

Mitosis- type of cell division, results in 2 daughter cells with identical genetic makeup 4 Phases, occurs in strict cell cycle order

Prophase- first phase Chromosomes become visible and spindle fibers begin to form, nuclear membrane disappears and chromosomes replicate and form sister chromatids

Metaphase- second phase Spindle fibers attached to chromosomes line up the chromosomes in middle of cell

Anaphase- third phase Spindle fibers pull apart the sister chromatids pulling the chromosomes away from each other to each end of the cell

Telophase- fourth and final stage Chromosomes are pulled completely apart to each cell end, two new nuclear envelopes form around the two sets of chromosomes Cell divides into 2 exact copies each with a set of chromosomes

Interphase- in-between phase, in the middle of 2 separate cell cycles Chromatin unwinds, cell grows

Meiosis- cell division that occurs in 2 sets of divisions Reduces number of chromosomes by half, produces 4 sex cells Similar process as mitosis, except chromosomes cross over, which causes mixing of genes

Video

Create 2 Venn Diagrams One comparing and contrasting sexual reproduction and asexual reproduction The second will compare and contrast mitosis and meiosis