Date post: | 05-Jan-2016 |
Category: |
Documents |
Upload: | colleen-johnson |
View: | 222 times |
Download: | 1 times |
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!
Comparison of mitosis and meiosis
Skin Cells Egg Cells
Diploid
Haploid
Somatic Cells or Body Cells Gametes or sex cells
Meiosis Review
Diploid Vs. Haploid?
Gametes Vs. Somatic Cells
Can you explain this diagram?
Meiosis FoldableDraw 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