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Transcript 
Cell Reproduction
and Heredity
How do little elephants grow up to be BIG elephants?
Why do animals shed their
skin?
Three reasons why cells reproduce
by asexual reproduction:
1. Growth
2. Repair
3. Replacement
Animated Mitosis Cycle
http://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
• http://prezi.com/6dcz8acgjysx/mitosis/
Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant vs. Animal
ANIMAL
• Cell membrane
pinches apart
• Has centrioles
PLANT
• Rigid cell walls do
not pinch apart
• Cell plate forms
between 2 new
nuclei
• No centrioles
Asexual Reproduction
• Organisms produced from one parent
like mitosis
• FISSION = division of organism into
parts (bacteria)
Asexual Reproduction
• BUDDING = organism
grows from body of
parent (hydra)
• REGENERATION = whole
organism may develop
from piece of organism or
when organism is injured
(sponges, planaria, sea
stars)
Meiosis
• Sexual Reproduction = new
organism produced when sex
cells from 2 parents combine
o Sperm and Egg cell (104)
• Meiosis = process of nuclear
division that produces sex
cells in the reproductive
organs
46
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Meiosis
o Human cells have 23 pairs of
chromosomes
• 46 total
o Sex cells have 23 chromosomes
• Why??
o Diploid = cell that has 2 of every kind of
chromosome
o Haploid = Sex cell with 1 chromosome
from each pair
Meiosis
23
23
• Fertilization = joining of egg and
sperm
• Zygote = cell that forms during
fertilization
oThe zygote will then undergo
mitosis to develop
46
Meiosis l & ll
• Please look at your handout
• What do you see happening?
• Begins with 1 cell
• Meiosis l forms 2 cells
• Meiosis ll results in 4 cells
Differences
• Meiosis
o 2 nuclear divisions
o Chromosomes line
up in pairs
o ½ number of
chromosomes
o 4 cells
o Crossing over during
Prophase I
• Mitosis
o 1 nuclear division
o Chromosomes line
up singly
o Same # of
chromosomes
o 2 cells
o No crossing over
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