B. _____________ Chromosomes are made of sections of DNA called genes. Genes are always in pairs. Each chromosome has many gene pairs. Cell with chromosomes.

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Presentation transcript:

B. _____________ Chromosomes are made of sections of DNA called genes. Genes are always in pairs. Each chromosome has many gene pairs. Cell with chromosomes inside the nucleus

DNA sugars nitrogen bases

Purposes of Cell Division

Purposes of in HumansCellCell DivisionDivision fold cut

Purpose: Cell division for reproduction creates offspring with traits from both mother and father. Called: MEIOSIS makes

MOMDAD egg sperm offspring (reproduction) X / \ /

Purpose: Cell division for growth and repair creates exact copies of a cell. Called: MITOSIS “My toe-sies”

X Skin Cell Skin Cell exact copy (growth & repair)

Quick Quiz: 1.Meiosis makes _____. 2.The purpose of meiosis is ______________. 3.Meiosis create egg and sperm cells with _____ the original chromosomes. 4.Egg and Sperm combine to create an __________ with unique traits. 5.Mitosis can be compared to a ______________. 6.Mitosis makes exact ______ of the original cell. 7.The purpose of mitosis is ________ and _______ of organisms. me reproduction half offspring copy machine copy growthrepair