MEiosis

Process of Meiosis I and Meiosis II

Prophase I

CHROMOSOMES WERE DUPLICATED EARLIER IN INTERPHASE AND THEY START TO CONDENSE. EACH PAIRS WITH ITS HOMOLOGUE AND SWAPS SEGMENTS. ONE OF THE TWO CENTROSOMES MOVES TO THE OPPOSITE SIDE OF THE NUCLEAR ENVELOPE WHICH BEGINS TO BREAK UP.

Metaphase I

ONE SET OF MICROTUBULES HAS TETHERED ONE CHROMOSOME OF EACH TYPE TO ONE SPINDLE POLE AND ANOTHER SET TETHERED ITS HOMOLOGUE TO THE OTHER SPINDLE POLE. A TUG OF WAR OF SORTS HAS ALLIGNED THE CHROMOSOMES MIDWAY BETWEEN THE TWO SPINDLE POLES.

Anaphase I

ONE OF EACH DUPLICATED CHROMOSOME, MATERNAL OR PATERNAL MOVES TO A SPINDLE POLE. ITS HOMOLOGUE MOVES TO THE OPPOSITE POLE. MOTOR PROTEINS AND MICROTUBULES ALLOW FOR THIS MOVEMENT.

Telophase i

ONE OF EACH TYPE OF CHROMOSOME HAS ARRIVED AT THE SPINDLE POLE. IN MOST SPECIES, THE CYTOPLASM DIVIDES AT THIS TIME. ALL OF THE CHROMOSOMES ARE STILL DUPLICATED.

MEIOSIS II

Prophase II

IN EACH CELL ONE OF THE TWO CENTRIOLES MOVES TO THE OPPOSITE SIDE OF THE CELL AND A NEW BIPOLAR SPINDLE FORMS. SOME SPINDLE MICROTUBULES HARNESS ONE CHROMATID OF EACH CHROMOSOME TO A SPINDLE POLE. OTHER MICROTUBULES HARNESS ITS SISTER CHROMATID TO THE OTHER POLE.

Metaphase II

BY NOW MICROTUBULES FROM BOTH SPINDLE POLES HAVE FINISHED A TUG OF WAR. THEY HAVE ALIGNED ALL OF THE STILL DUPLICATED CHROMOSOMES MIDWAY BETWEEN THE POLES.

Anaphase II

THE SISTER CHROMATIDS OF EACH CHROMOSOMES MOVE APART AND ARE NOW INDIVIDUAL UNDUPLICATED CHROMOSOMES. MICROTUBULES PULL THEM TOWARD OPPOSITE SPINDLE POLES AS OTHER MICROTUBULES PUSH THE POLES APART. A PARCEL OF ONE OF EACH TYPE OF CHROMOSOME WILL END UP NEAR EACH POLE.

Telophase ii

A NEW NUCLEAR ENVELOPE ENCLOSES EACH PARCEL OF CHROMOSOMES SO THERE ARE NOWFOUR NUCLEI. THE CYTOPLASM DIVIDES. EACH OF THE DAUGHTER CELLS NOW HAS A HAPLOID (N) OF UNDUPLICATED CHROMOSOMES.

Created By
Jake Heller
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