Admit Slip 10/14/16 How did life begin? What do you believe? Date: 1/26/15 Topic: Biochemistry Page # ___ Must wear uniforms/IDs! 10/14/16 EBHS Admit Slip How did life begin? What do you believe? (Take your best guess)
Journal Setup Mitosis Meiosis
How do cells divide?* Scientific word for cell division? Asexual reproduction mitosis (identical cells) Sexual reproduction meiosis (different cells)
Cell replication* Meiosis responsible for sex cell replication (sexual reproduction) Mitosis responsible for somatic (body) cell replication (also responsible for asexual reproduction in other organisms) Human body goes from a few cells a trillion cells Differentiation = cell changes from one cell type to another
Ploidy Ploidy = references # of chromosomes One set of chromosomes = n = haploid/monoploid Two sets of chromosomes = 2n = diploid Sperm = n (haploid) Egg = n (haploid) sperm + egg = zygote = 2n (diploid) Humans: 2n = 46 n = 23 Dog: 2n = 78 n = ____
Mitosis = results in diploid cells* Meiosis = results in haploid cells* Chromosome # does NOT change* Chromosome # reduced by half*
Interphase IPMATC
Mitosis & Meiosis Mitosis: https://www.youtube.com/watch?v=Vl N7K1-9QB0 Meiosis: https://www.youtube.com/watch?v=D 1_-mQS_FZ0
Word Associations* Bacteria Humans Asexual reproduction Identical offspring Mitosis Haploid Humans Sexual reproduction Unique offspring Mitosis (body cells) & Meiosis (sex cells) Diploid (except for sperm/egg) For each organism, determine… Use sexual or asexual reproduction? Result in identical or unique offspring? Cell division through mitosis or meiosis? Produce diploid or haploid cells? ^^ Discuss in pairs
Fertilization & Development Humans: internal fertilization & internal development (sexual intercourse) & (fetus grows in uterus of mother) Fish: external fertilization & external development (eggs on ground, male drops sperm on eggs) & (zygote grows inside egg, outside mother) Which strategy is MORE LIKELY to lead to an offspring that successfully develops into an embryo and eventually a baby? Internal development and fertilization is the best way to ensure offspring survival**
Asexual vs. Sexual Repro Review hydra Asexual vs. Sexual Repro Review Sexual repro is when … Sperm & egg combine (doesn’t matter how!) Gametogenesis (production of gametes) Asexual repro methods… Budding Binary fission Sporulation Regeneration Cleavage furrow spores
Baby Logistics Boy Girl Twins XY XX Which gamete decides if it’s going to be a boy or a girl? Egg = X Sperm = X or Y Chance of having boy or girl every time? 50%
Reproduction Packet Continue from yesterday… Person 1: Reads question & answers out loud Person 2: Circles all vocab words in question/answers Person 1: Look-up any needed information online Together: Choose an answer
Mitosis/Meiosis Card Sort Mark each box with either MIT = mitosis Or MEI = meiosis