CH 8 Reproduction and Inheritance. Reproduction Asexual Reproduction Sexual Reproduction LM 340
Bacterial Reproduction
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Transcript of Bacterial Reproduction
Cherubim CurayagBSEd – Bio Sci 3
SEXUAL REPRODUCTION
Binary Fission - creates new
bacteria but no genetic
diversity
single DNA molecule replicates and both copies
attach to the cell membrane.
The cell membrane begins to grow
between the two DNA molecules
the cell membrane begins to pinch
inward;cell wall then forms
between the two DNA molecules
dividing the original cell into two
identical daughter cell
BINARY FISSION
SEXUAL REPRODUCTIONSex in bacteria differs somewhat from what we consider
sex in eukaryotes. It involves the PLASMID, which has
several important characteristics:
A plasmid is a loop of DNA. Plasmids
can multiply autonomously within the
cell. Thus we may find from zero to
many of one or more plasmids in each
cell.
SEXUAL REPRODUCTION
Many plasmids can insert into the
DNA of the nucleus, and detach
from it. In doing so, the plasmid
may leave part of the plasmid DNA
behind, and take some of the
nuclear DNA with it.
SEXUAL REPRODUCTION
plasmids can transfer from cell to
cell. The cells need not be of the
same bacterial 'species'.
BACTERIAL RECOMBINATION:
Conjugation
Transformation
Transduction
CONJUGATION
one bacterium connects
itself to another through a
protein tube structure called
a PILUS. Genes are
transferred from one
bacterium to the other
through this tube.
TRANSFORMATION
the bacterium binds the DNA
and transports it across the
bacterial cell membrane. The
new DNA is then
incorporated into the
bacterial cell's DNA.
TRANSDUCTION
involves the exchanging of
bacterial DNA through
bacteriophages.
BACTERIOPHAGES
• viruses that infect bacteria.
There are two types of
transduction: generalized
and specialized transduction.
The End