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.
Mind Map
클릭해서 펼치기
클릭해서 인터랙티브 마인드맵 전체 보기
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
텍스트나 타임스탬프를 클릭하면 동영상의 해당 장면으로 바로 이동합니다
공유:
대부분의 자막은 5초 이내에 준비됩니다
원클릭 복사125개 이상의 언어내용 검색타임스탬프로 이동
YouTube URL 붙여넣기
YouTube 동영상 링크를 입력하면 전체 자막을 가져옵니다
자막 추출 양식
대부분의 자막은 5초 이내에 준비됩니다
Chrome 확장 프로그램 설치
YouTube를 떠나지 않고 자막을 즉시 가져오세요. Chrome 확장 프로그램을 설치하면 동영상 시청 페이지에서 바로 자막에 원클릭으로 접근할 수 있습니다.
