Mitosis and Meiosis
The next 2 slides are Mitosis
Copy chart into odd page in notebook and draw pictures for each step of Mitosis Interphase: DNA condenses into a chromatid and is copied. Picture Mitosis : prophase , metaphase , anaphase, and telophase Prophase: The chromosomes are condensed, the spindle fibers begin to form from the centrioles, and the nuclear membrane dissolves. Metaphase :The chromosome align on the cell’s middle Anaphase: Chromatids are separated and moved to opposite poles. Telophase: The nuclear membrane forms around both sets of chromosomes. The cell divides into two identical cells Picture Cytokinesis: The cell divides into two identical cells.
Mitosis Interphase: DNA condenses into a chromatid and is copied. Prophase: The chromosomes are condensed, the spindle fibers begin to form from the centrioles, and the nuclear membrane dissolves. Metaphase :The chromosome align on the cell’s middle Anaphase: Chromatids are separated and moved to opposite poles. Telophase: The nuclear membrane forms around both sets of chromosomes. The cell divides into two identical cells Cytokinesis: The cell divides into two identical cells. Mitosis
The next slide is Meiosis
Questions to answer in class 11/1/2016 What are the three stages in the cell cycle? What is the function of interphase? Describe the difference in steps between mitosis and meiosis. What is the function of cytokinesis? What are chromosomes? What is the significance of crossing over in prophase 1? Define non-disjunction in meiosis. What are the consequences of non-disjunction? Describe two genetic disorders that occurred because chromosomes were not separated properly.
Mitosis What do cells have to do during Interphase? Interphase = the cell keeps growing , copies the DNA, duplicates necessary organelles , takes up nutrients , makes proteins What happens to the cell membrane , nuclear envelope , and centrosomes during Mitosis? The cell membrane gets larger than divides in half. (cytokinesis) The nuclear envelope dissolves then reforms during telophase. The centrosomes duplicate and make two centrosomes in the cells. What two things make up centrosomes? Centrosomes are made up of centrioles and microtubules. What is the function of centrosomes? The function of centrosomes are attach to the chromosomes and pull them apart What is DNA wrapped around to be condensed? When DNA is condensed it is wrapped around a protein called a histone. The X shaped DNA is called a chromosome. The two slashes are called sister chromatid.
Back of half Sheet Interphase Draw the three parts of interphase. Then the phases of Mitosis during the video. Interphase
Chromatids are separated and moved to opposite poles. Draw on back of half sheet leave room underneath each drawing to take notes Nuclear membrane dissolves Spindle fibers attach to chromosomes Chromosomes line up in middle Chromatids are separated and moved to opposite poles. The nuclear envelopes reform around the chromatids. The cell splits in two Cytokinesis