mitosis introduction & (a)sexual reproduction review. january 23, 2013
TRANSCRIPT
Mitosis Introduction & (A)sexual reproduction review.
January 23, 2013
DO NOW!
1. Which cell organelle contains all of eukaryotic cells’ DNA?
2. How many parent organisms are involved in ASEXUAL reproduction?
3. Which involves the mixing of DNA: sexual reproduction or asexual reproduction?
Homework
Make Flash cards for each vocabulary word that we go over today.
Use actual index cards OR…
Use a piece of paper cut up into index card sizes.
Objective
To compare forms of sexual and asexual reproduction
To understand the process of mitosis
Sexual Reproduction
Sexual Reproduction
1. 2 parents 2. Sex cells: sperm and
egg 3. Sperm and egg join=
fertilization 4. Offspring look different
from parent (mixed DNA)
Sexual Reproduction
Sexual Reproduction
5. Examples– Humans, some plants,
mammals, fish, reptiles, etc.
Sexual Reproduction
Asexual Reproduction
Asexual Reproduction
1. One parent 2. No sex cells 3. Offspring produced by
cell division 4. Offspring identical to
parent (same DNA) 5. Several types in plants
and animals
Types of Asexual Reproduction Binary
Fission
1. Organism divides in half 2. 2 identical daughter cells
produced 3. Daughter cells are half
the parent’s size 4. Daughter cells grow,
then divide too 5. In bacteria
Types of Asexual Reproduction Budding 1. Small bud grows out of
parent organism 2. Two different sized cells
made (with identical DNA) 3. Bud breaks off and
grows 4. In yeast and hydra
Types of Asexual Reproduction Regeneration 1. Repair/ grow lost body
parts 2. Left over cells divide to
make more cells 3. Lobsters, starfish, lizards
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
What type of reproduction is this??? Explain…
Asexual vs. Sexual
Mitosis
Mitosis 1. Cell division 2. Causes multicellular
organisms to grow (even in humans)
3. Cells are identical to parent cells (same DNA)
Mitosis
Phase 1- Interphase– Chromosomes
copied– Cell growing &
resting– DNA is in the form
of Threadlike chromatin (messy DNA ball)
Mitosis
Phase 2- Prophase– Mitosis begins– Chromosomes are
rodlike pairs– Centrioles move
to poles– Spindle fibers
connect centrioles
Mitosis
Phase 3- Metaphase– Chromosomes
attach to spindle fibers
– They line up in middle of cell
Mitosis
Phase 4- Anaphase– Sister chromatids
pull apart– One sister of each
pair goes to opposite ends of the cell
Mitosis
Phase 5- Telophase– 2 new nuclei form– Chromosomes are
in a ball again (chromatin)
Mitosis
Phase 6- Cytokinesis– Cytoplasm
pinches in to form 2 new identical daughter cells
Which phase of mitosis is this? Explain…..
Which phase of mitosis is this? Explain…..
Which phase of mitosis is this? Explain…..
Which phase of mitosis is this? Explain…..
Which phase of mitosis is this? Explain…..
Which phase of mitosis is this? Explain…..