I will compare mitosis and meiosis by completing a double bubble and web quest activity. Outcome.
-
Upload
stuart-horton -
Category
Documents
-
view
215 -
download
0
Transcript of I will compare mitosis and meiosis by completing a double bubble and web quest activity. Outcome.
I will compare mitosis and meiosis by completing a double bubble and web quest activity.
Outcome
http://www.youtube.com/watch?v=65BV5dXXxzM
Meiosis & Fertilization
Sexual Reproduction - two individuals produce offspring that have genetic characteristics from both parents (unique – not clones!)
Outcome (proposed): Distinguish between the products of mitosis and meiosis...
Meiosis The process that forms gametes (sex
cells) These gametes (sex cells) are sperm
and egg cells
Meiosis Chromosome number is
reduced by one-half 2nn Diploid (2n) – 2 copies of
each chromosome Haploid (n) – 1 copy of
each. End result – 4 haploid
gametes
Meiosis
2 cell divisions
Chromosome Number
Organism Somatic (Body Cell)
Gametes (sex cells)
Human 46
Kangaroo 16
Pegasus 50
23
8
100
Homologous Chromosomes Each cell has 2
copies of each chromosome
Homologous chromosomes Have the same
genes in the same locations
Crossing-over
Homologous chromosomes exchange parts
Results in genetic variation different
combinations of genes
1 1
1 2 3
2 3
Fertilization
Combination of gametes (sperm and egg) to form zygotes
Zygote – diploid (2n) cell (two copies of each chromosome) formed by two haploid cells (1n + 1n = 2n)
Quick Quiz
1. Which of these does not occur during meiosis? (2007)
A production of identical gametes
B production of new gene combinations
C crossing-over of homologous chromosomes
D reduction of chromosome number by one-half
2. Sea stars are genetically different from each other and from their parents. These genetic differences are the result of (2006)
A mitosis
B cloning
C sexual reproduction
D asexual reproduction
Practice Questions
3. Horses have 64 chromosomes in each body cell. If a horse cell undergoes meiosis, how many chromosomes should be in each gamete? (2007)
A 16
B 32
C 64
D 128
4. A sperm cell of a moth has 112 chromosomes. How many chromosomes are in the moth’s wing cells? (2005)
A 66
B 112
C 224
D 448
64Body cell
32 32
112 112 224
I will compare mitosis and meiosis by completing a double bubble and web quest activity.
Outcome
Web Quest!
Groups will follow the directions on their paper.
Stay at your assigned lab station! When you are done, there is another
activity to work on.
Computer GroupsGroups
2B Melvin Peter Tanner
2A Nina Yanet3B Kerra Glenda Leanne3A LaRonjae Sam
4B Akirah Alyanna Nick4A Malik Jamar5B Karen Emma G5A Chris Colin6B Emma P Jessica F6A Jessica S Sophia7B Drea Sydney7A Jenifer Devon