sexual reproduction in Paramecium

reproduction in Paramecium occurs by

binary fission and conjugation due to

repeated binary fission x' Paramecium

become weak and inactive

to rejuvenate the lost vigor conjugation

takes place conjugation temporary union

between two paramecia of different

clones for the exchange of nuclear

material and multiplication is called

conjugation it is a type of sexual

reproduction Paramecium have two nuclei

a large macro nucleus and small micro

nucleus it is responsible for

reproduction conjugates paramecia that

undergo conjugation are called

conjugates the two conjugates mating

types comes together and closely oppose

one another at the region of site of

airings the pellicle at the site of the

union disintegrates and the cytoplasm of

the two conjugates merges with each

other is called cytoplasmic bridge

formation of pronuclei the macro nuclei

of both the conjugates disappear slowly

the micro nucleus of each conjugant

divides mitotic aliy to produce four

haploid nuclei of these four haploid

daughter nuclei three from each

conjugant disintegrate so that one

nucleus remains in each the remaining

micronucleus in each conjugant divides

unequally to form a small migratory or

male pronucleus and a large stationary

of female pronucleus formation of sync

carrion the male pronucleus of one


moves through the cytoplasmic bridge

into the other conjugant

and fuses with the female pronucleus it

is then called sync Aryan or zygote

nucleus after formation of diploids and

carryin two conjugates are separate each

separated individual is called X

conjugates the sync carrion of each X

conjugant divides thrice by mitosis so

that each x conjugant has 8 nuclei of

these 8 nuclei for enlarge in size to

become macro nuclei the remain 4 behave

as micro nuclei division of x conjugant

three of the four micro nuclei

disintegrate so that each x conjugant

contains for macro nuclei and one micro

nucleus each x conjugates divides twice

along with its micro nucleus and forms

for daughter paramecia the daughter

Paramecium receives one macro nucleus

from the x conjugates

but does not divide along with x

conjugant so that finally daughter

Paramecium has one macro nucleus and one

micro nucleus by the end of conjugation

a daughter paramecia are producers from

both the conjugates significance the

conjugation is a method of nuclear

reorganization it restores the lost

vigor and vitality due to repeated

binary Frisians

the macro nucleus of daughter paramecia

is formed from sync area of x conjugant

so it discharges the physiological

activities more vigorously new

characters appear in the dotter

paramecia due to exchange of genetic

material between conjugates