Download Meiosis

Meiosis
Review:









Homologous chromosomes
Gametes
Gene
Diploid (2n)
Haploid (n)
Somatic cells
Autosomes
Sex chromosomes
Mitosis
Why is sexual reproduction more
beneficial to a species than asexual
reproduction – over time?
Asexual Reproduction
Sexual Reproduction
leads to diversity!
How does meiosis result in
diversity?

Homologous chromosomes trade parts during
Prophase I – crossing over.

Homologous chromosomes get shuffled –
Independent Assortment
You never know which of the homologous chromosomes
will end up in which egg.
Where are gametes made in the
human body?
Ovary
Meiosis – Reduction Division

Watch this process and think about how
meiosis (the formation of gametes) is
different from mitosis.
How is a zygote formed?
Meiosis: Males vs. Females



Males:
Meiosis and sperm
production begins at
puberty
Continuous process that
males will always
undergo – takes 9 weeks

Females:

Meiosis and egg production
begins before birth. Process
stops abruptly, and does not
begin again until puberty
At puberty, one egg each
month resumes meiosis and
finishes its development
Process stops when a women
reaches menopause (around
50 years of age)
Meiosis of a singe egg could
take 50 years to complete!



Skin Cells
Somatic Cells or Body Cells
Egg Cells
Gametes or sex cells
Comparison
of mitosis
and meiosis
Diploid
Haploid
Meiosis Review
Diploid Vs. Haploid?
Gametes Vs. Somatic Cells
Can you explain this diagram?
Meiosis Foldable
Draw and Label:
 Diploid cells
 Homologous chromosomes
 Crossing over
 Haploid cells
Explain: Are the newly formed haploid cells
genetically identical to the parent cell? Explain why or
why not.
Meiosis Review
The Meiosis Square Dance
 Meiosis I Animation
 Meiosis II Animation
