Transcript 5:4 Asexual Reproduction

5.4 Asexual Reproduction
KEY CONCEPT
Many organisms reproduce by cell division.
5.4 Asexual Reproduction
Asexual Reproduction-the creation of offspring from a
single parent-these organism inherit all of their genetic
material from one parent. Offspring are genetically
identical to the parents.
MITOSIS CELL DIVISION RESPONSIBLE FOR GROWTH
AND REPAIR
• Sexual Reproduction-genetic material from two parents
combine forming genetically unique individuals. Involves
reproductive cells called gametes (egg or sperm cells)
• MEIOSIS
5.4 Asexual Reproduction
4 types of asexual reproduction
– (1)Binary fission produces two daughter cells
genetically identical to the parent cell.
– Binary fission occurs in
prokaryotes.
parent cell
DNA
duplicates
cell begins
to divide
daughter
cells
5.4 Asexual Reproduction
Some eukaryotes reproduce through mitosis.
• (2)Budding forms a new organism from a small projection
growing on the surface of the parent.
Hydra
bud
Yeast
5.4 Asexual Reproduction
• (3)Fragmentation is the
splitting of the parent into
pieces that each grow into a
new organism.
• (4)Vegetative
reproduction forms a new
plant from the modification
of a stem or underground
structure on the parent
plant.
5.4 Asexual Reproduction
Advantages
• More efficient in ideal conditions
• All organisms can potentially reproduce
• Do not have to waste time finding a mate
Disadvantages
More vulnerable
Lack adaptability in changing conditions
Less diverse
5.4 Asexual Reproduction
• Environment determines what form of reproduction is most
advantageous.
– Asexual reproduction is
an advantage in
consistently favorable
conditions.
– Sexual reproduction is
an advantage in
changing conditions.