b. _____________
DESCRIPTION
Chromosomes are made of sections of DNA called genes. B. _____________. 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. fold. Purposes of in Humans. Cel l. D i v - PowerPoint PPT PresentationTRANSCRIPT
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
DNAsugars
nitrogen bases
Purposes of Cell Division
Purposes of in HumansCell
Division
fold
cut
Purpose: Cell division for reproduction creates offspring with traits from both mother and father.
Called: MEIOSISmakes
MOM DAD
egg sperm
offspring
(reproduction)
X X
X X
X X
X X
/ /
/ /
/ /
/ /
\ \
\ \
/ /
/ /
Purpose: Cell division for growth and repair creates exact copies of a cell.
Called: MITOSIS
“My toe-sies”
X X
X X
X X
X 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
growth repair