Mitosis/Meiosis

Bell Ringer 5 MIN. Write learning targets Have your homework out and ready to turn in Answer the following questions: What kind of molecules easily cross the plasma membrane? What is the cell membrane made of? Draw a diagram of a cell in hypertonic solution. Show which direction the water will be moving.

Agenda Bell Ringer (5 minutes) Introduction: Cell division in cancer (5 minutes) Notebook Input (20 minutes) Partner practice (30 minutes) Independent Practice (20 minutes) Exit Quiz (10 minutes)

What Causes Cancer? https://www.youtube.com/watch?v=BmFEoCFDi-w

Notebook Input We will be using a guided notes worksheet Write what is in red!!!

Mitosis Process of cell division that produces two genetically identical daughter cells (exact copies) Asexual process

Chromosome Chromatid Centromere Spindle Centrioles

Order: iPMATc Pro=before Meta=middle A=apart Telo= the end Break between divisions (intermission) Cell grows and duplicates DNA Chromatin condenses Spindle forms Nuclear membrane breaks down

Sister chromatids separate Chromosomes move apart Chromosomes line up in the middle Connected to spindle at centromere Sister chromatids separate Chromosomes move apart Nuclear membrane reforms around each set of chromosomes Spindle breaks apart

Division of cytoplasm

Meiosis Process of cell division that produces four genetically different daughter cells Sexual process

Body cell Sex cell Full # of chromosomes (1 set from dad, 1 from mom) Half the # of chromosomes

Reduces # of chromosomes in new cells to half Produces haploid egg and sperm (sexual reproduction) Consists of two cell divisions that make 4 genetically different daughter cells

Independent assortment increases genetic variation Crossing over: chromosomes overlap and exchange part of their chromatids, resulting in genetic variation Independent assortment increases genetic variation Homologous chromosomes pair up to form a TETRAD, crossing over Homologous chromosomes line up randomly in the middle Chromosomes reach opposite sides, new cells are now haploid Homologous chromosomes randomly separated= independent assortment

Sister chromatids separate Sister chromatids move to the middle Four cells produced Each contains half of parent cell’s # of chromosomes Chromatin condenses Sister chromatids separate Sister chromatids move to the middle

https://www.youtube.com/watch?v=Ba9LXKH2ztU

Partner Work 30 MIN. Complete the practice questions FIRST Then, match the flashcards with your partner Partner groups who FINISH COMPLETELY with all answers CORRECT will receive candy!

Independent Practice 20 MIN. Work silently and independently to finish the worksheet!

Exit Quiz 10 MIN.

Home Learning Summarize the processes of mitosis and meiosis in your own words. Write at least 3 sentences for EACH process. For example: “In mitosis, first the cell prepares for division. The nuclear membrane breaks apart and the chromosomes condense. Next…”