3.2.1- Meiosis
Interphase I
In interphase I, cells undergo a round of DNA replication, forming duplicate chromosomes.
Prophase I
In prophase I, each chromosome pairs with it's corresponding homozygous chromosome to form an X.
Metaphase I
In metaphase I, spindle fibers attach to the chromosomes
Anaphase I
In anaphase I, the fibers pull the homologous chromosomes away from eachother, to opposite sides of the cell.
Telophase & Cytokinesis
In telophase & cytokinesis, nuclear membranes form. The cells seperate into two cells
Prophase II
Meiosis I results in two haploid cells, meaning each has half the number of chromosomes it started with
Metaphase II
The chromosomes line up in a similar way to the metaphase stage of mitosis
Anaphase II
The sister chromatids seperate and move towards opposite sides of the cell
Telophase II & Cytokinesis
Meiosis II results in four haploid (N) daughter cells
Questions
How does meiosis create genetic variation?
Meiosis creates genetic variation by "crossing over" and independent assortment.p
What is crossing over?
Crossing over is when homologous chromosomes exchange genetic material, creating genetic variation.
What is non-disjunction?
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division.
Meiosis creates genetic variation by "crossing over" and independent assortment.p
What is crossing over?
Crossing over is when homologous chromosomes exchange genetic material, creating genetic variation.
What is non-disjunction?
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division.