Diagram a cell with four chromosomes going through meiosis.
Mitosis vs. Meiosis Mitosis Mitosis One division Two divisions 2 diploid daughter cells Identical to parent cell Mitosis Two divisions 4 haploid daughter cells Genetically different from parent cell http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter28/animation__how_meiosis_works.html
Nucleus chromosomes
Get one small, one medium and one large of each color chromosome. What do the colors represent? The Beads?
Pair up chromatids with same size and color
Pair up chromatids with same size and color What does this represent? What stage? Haploid or diploid?
Match homologous chromosomes
Match homologous chromosomes What are homologous chromosomes. Carry the same traits Each homologous pair has one from each parent
Demonstrate crossing over during prophase.
Demonstrate crossing over during prophase.
Demonstrate metaphase
Demonstrate metaphase
Demonstrate the first division Anaphase I and Telophase I
Demonstrate the first division Anaphase I and Telophase I
Move your cells through the second division.
Move your cells through the second division.
How many daughter cells do you have? Are the daughter cells haploid or diploid? Are the cells genetically Identical or different from the parent cell?
4 Haploid Daughter Cells
Parent Cell Daughter Cells
Possible Combinations of chromosomes What does n represent? What was our haploid number of chromosomes? What is the possible number of combinations? 8 In people possible 8388608 combinations. http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter28/animation__random_orientation_of_chromosomes_during_meiosis.html
Sexual Reproduction Combines the genetic material of two organisms. Introduces new gene combinations in a population. Leads to genetic Variability in the population. Gametes produced in meiosis fuse to form a zygote. Gamete-reproductive cell that contains the haploid set of chromosomes…..sperm and egg Zygote- Cell formed from fusion of gametes that contains the diploid set of chromosomes.
Sexual Reproduction Methods External Fertilization: the eggs are fertilized outside of the body Internal Fertilization: the eggs are fertilized within the female reproductive tract Conjugation: cells exchange genetic material Prokaryotes
Asexual Reproduction Offspring arise from a single parent. Offspring genetically identical to parent. More likely to inherit mutations. Leads to less diversity. Mitosis
Asexual Reproduction Methods Budding offspring grows out of the body of the parent. Spores a reproductive cell capable of developing into a new individual without fusion with another reproductive cell. Fission separation of the body into two new bodies
Quiz Compare and contrast sexual and asexual reproduction.