Transcript reproduction

REPRODUCTION
Výukový materiál GE 02 - 35
Tvůrce: Mgr. Šárka Vopěnková
Tvůrce anglické verze: ThMgr. Ing. Jiří Foller
Projekt: S anglickým jazykem do dalších předmětů
Registrační číslo: CZ.1.07/1.1.36/03.0005
Tento projekt je spolufinancován ESF a SR ČR
PRIMA 2014
REPRODUCTION
doubling of cellular
components>
strictly controlled
and monitored
 nuclear mass is
responsible for this
process
 in the nucleus there
are chromosomes

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
chromosomes in the nucleus duplicate
two copies of all information are
prepared
nucleus divides into two
 the number of organelles doubles
 both new daughter cells receive half
the material of the parent cell

REPRODUCTION
daughter cells are identical
 they are similar to the maternal cell
 they are usually smaller
 repeated cell division > by the growth
of an individual

REPRODUCTION
Simplified drawing of cell division:
1) Cell got bigger and can divide.
2) All parts of the cell including the
content of the nucleus – hereditary
information – double.
3) Nuclei and doubled cell parts
divide spaciously. On each end
of the cell there is one nucleus and
about a half of cell parts
4) In the middle a new membrane
arises, which separates both the parts
from each other
5) Two new almost identical
daughter cells star a new life.
When they grow up to the correct size,
they can also separate.
REPRODUCTION
DIVISION OF BACTERIA
REPRODUCTION
ways of reproduction:
 asexual
 sexual
 asexual reproduction:
 new cells are formed from one cell
 both parents are never needed
 bacteria
 plants
 fungi
 protozoa

REPRODUCTION
REPRODUCTION
sexual reproduction:
 new individual grows by dividing cells
 at the beginning there are two
different sex cells
 sex cells = gametes
 by fusion of gametes a zygote is
formed

REPRODUCTION
WORKSHEET
DESCRIBE
THE PICTURE
SOURCES

DOBRORUKA, Luděk J. Přírodopis. 2. vyd. Praha:
Scientia, 1999, 127 s. ISBN 80-718-3168-9.