Ch. 4-1 cell division & Mitosis

What is Mitosis?

It is the process in which the nucleus divides to form 2 identical nuclei

Tell about "Anaphase" (away or apart)

-Centromere divides -Chromatids separates; moves to opposite ends of the cell

Tell about "Metaphase" (middle)

-Chromosomes line up along the equator (center) -Centrioles at opposite ends of cells -Centromeres attach to spindle fibers

Tell about "Telophase" (two nuclei)

-Spindle fibers disappear -Nuclear membrane reappears; new nucleus forms Cytokinesis (cytoplasm splits) -Division of the cytoplasm separates to form 2 new cells In animal cells, cell membrane pinches in middle In plant cells, appearance of a cell plate because cell wall is rigid

Tell about "Prophase"

-chromosomes condense -nuclear membrane disappears -Centrioles (only in animal cells) start to move to opposite ends -spindle fibers begin to stretch across the cell

Remember "Mitosis" is:

1. Division of a nucleus; produces 2 New nuclei identical to each other and the original nucleus 2. Each cell in your body has 23 pairs of chromosomes

Condensed DNA is called ____.

Chromosomes

Mitosis (I Pray More At The Church)

Inter phase (90%); Prophase; Met phase; anaphase; telophase;

What is cell division?

It causes many celled organisms to grow because increases the number of cells.

What happens in Interphase?

It is the longest part of the cell life cycle -resting period between cell division(90%); nerve and muscle cells are always in interphase. DNA is copied; chromosomes duplicate

Another name for cell division is _____.

Mitosis

What is chromatids?

They are chromosomes coiled tightly into 2 thick strands held together at a region called a centromere.

Where are chromosomes found and what do they contain?

They are found in the nucleus and contain hereditary material.

In interphase, the DNA is in the form of loose threads called ___.

chromatin

What is the term for the two new cells that are identical to each other?

daughter cells