Meiosis is a two-stage cell division process (Meiosis I and Meiosis II) that reduces a diploid cell into four genetically distinct haploid daughter cells, essential for sexual reproduction.
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the process of cell division that
results in gametes is known as meiosis
sometimes known as reduction division we
refer to gamet as sex cells such as
sperm in men and egg in women meiosis is
divided into the meiosis one stage and
the meiosis 2 stage of cell division
there are four phases in meiosis 1
prophase 1 metaphase 1 anaphase 1 and
telophase 1
additionally there are four phases in
meiosis 2 prophase 2 metaphase 2
anaphase 2 anaphase 2 meiosis 1 now
let's focus on the first stage of
meiosis known as meiosis 1 prophase 1
commences with a diploid cell its
chromatin contains two sets of
chromosomes one inherited from each
parent during this phase the DNA and the
chromatin replicates and condenses into
recognizable x-shaped chromosomes and
its identical sister chromites of each
chromosome the chromosomes couple up
with their corresponding counterparts in
a fascinating process called synapsis
generating a tetrad made up of four
sister chromites the true magic now
begins with crossing over segments of
alal swap across chromatids during this
genetic exchange event creating brand
new Gene
combinations as meiosis 1 progress the
nuclear membrane vanishes and spindle
chromosomes metaphase 1 the moment of
alignment where homologous chromosomes
line up at the cells
equator then comes anaphase 1 and the
spindle fibers diligently separate the
homologous chromosomes in each tetrad
pulling them to opposite poles of the
cell with til Phase 1 one chromosome
from each homologous pair takes position
at separate poles although they still
remain in the form of sister chromites
however each chromosome is still
composed of sister chromites
remember that the sister chromites of
each chromosome are no longer identical
due to AIC exchange and
crossovers the spindle fibers then
disappear and the nuclear envelope
reforms around the
chromosomes finally cyto canis occurs
meiosis one ends with two genetically
distinct haid daughter cells each haid
cell contains only one set of
chromosomes consisting of paired sister chromites
chromites
both cells now enter the next stage meiosis
meiosis
2 however unlike meiosis 1 DNA is not
replicated until meiosis 2 begins also
in prophase 2 the nuclear envelope
disappears and spindle fibers fan out
from the two sets of paired
centrioles during metaphase 2 the
chromosomes in each cell align at the
equator and attach to spindle fibers at
either pole during anaphase 2 the sister
chromites of each chromosome separate
and migrate to opposite poles once the
sister chromed separate they are called
chromosomes finally in Tila Phase 2 the
spindal fibers disappear the nuclear
membrane regenerates and both cells
undergo cyto
canis meiosis 2 ends with four
genetically distinct haid daughter cells
each containing only one set of chromosomes
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