Unit 5: Reproduction and Development Chapter 18: Cell Reproduction _________ & ___________

A. Reproduction 1. _______________ - Life process by which living things _________ other living things of the _________________ - Not every _____________________ needs to reproduce - If the species is to survive then at least some individuals need to reproduce - Organisms pass on ____________________ to the next generation

B. Cell Division - _______________________________ through cell division - cells must divide _________________________________ - cell division is a series of complex changes that leads to new cells – specific phases of cell division - new cells = __________________________

1. _________________________ - carry _________________ (______) - must be copied (__________) before any cell division starts - normally a cell has ____________________ (__) = ______ - chromosomes come in _______________ - humans have __________________ _____________________________ - different organisms have different numbers of chromosomes

2. Mitosis & Meiosis MitosisMeiosis Used for: Produces: # of daughter Cells Chromosome #: # of divisions: Compare DNA:

b. _______________________ process during meiosis by which _____________________ _________________________ - millions of possible chromosomal combinations a. ________________________ process during ______ by which ________________________ _____________ and mix up the genetic information Meiosis Variation

3. ___________________ - a group of diseases characterized by __________________ - “When Good Cells Go Bad!” - ______________ = group of cancer cells - ______________ = cancer cells break loose a spread through the body - Genetic and Environmental links to rates of cancer

3. __________________ - cells that have the ability to become ___________________ - all cells have the _________________________ - ________________________________________________ - once cells are specialized they can’t go back - use stem cells to ___________________________