Unit 5: Reproduction and Development - portnet.org

Unit 5: Reproduction and Development - portnet.org

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 Mitosis

Used for: Produces: # of daughter Cells # of divisions: Chromosome #: Compare DNA: Meiosis

a. ________________________ process during ______ by which ________________________ _____________ and mix up the genetic information b. _______________________ process during meiosis by which _____________________

_________________________ - millions of possible chromosomal combinations 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 cant go back - use stem cells to ___________________________

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