Cell Division. Mitosis and Cell Division. All cells go through a cell cycle composed of cell division portion (mitosis) and "resting period" (interphase). Comparing Mitosis and Meiosis. Observational activity with the person next to you… look at the two processes…..( pages 249 and 273)
Sexual reproduction in a population should decline in frequency relative to asexual reproduction because...
Chromosomes condense and become visible
Homologous chromosomes come together in pairs to form tetrads in a process called synapsis
Chromatids exchange segments in a process called crossing over
Rearranges genetic information and increases diversity This is Different from mitosis!!!
Mitotic spindle forms
Explain how reduction division results in the formation of haploid gametes or spores.
2. SC.912.L.15.15 Describe how mutation and genetic recombination increase genetic variation
3. SC.912.L.16.17 Compare and contrast mitosis and meiosis and relate to the processes of sexual and asexual reproduction and their consequences for genetic variation.
Two equally probablearrangements ofchromosomes atmetaphase I
Daughter cells ofmeiosis I
Daughter cellsof mitosis
Daughter cells of meiosis II
Occurs during interphase beforemitosis begins
Occurs during interphase before meiosis I begins
One, including prophase, metaphase,anaphase, and telophase
Two, each including prophase, metaphase, anaphase,and telophase
Occurs during prophase I along with crossing overbetween nonsister chromatids; resulting chiasmatahold pairs together due to sister chromatid cohesion
Does not occur
Two, each diploid (2n) and geneticallyidentical to the parent cell
Four, each haploid (n), containing half as manychromosomes as the parent cell; genetically differentfrom the parent cell and from each other
Number of daughter cellsand geneticcomposition
Enables multicellular adult to arise fromzygote; produces cells for growth, repair,and, in some species, asexual reproduction
Produces gametes; reduces number of chromosomesby half and introduces genetic variability among the gametes
Role in the animal body
SC.912.L.16.17 Compare and contrast mitosis and meiosis and relate to the processes of sexual and asexual reproduction and their consequences for genetic variation. 19 points total
Make a Venn diagram to compare Mitosis and meiosis 5 points per section. Number and name phases when you list things!
Mitosis in common Meiosis
Name 2 places in the process where genetic variation is increased
Which process produces cells for sexual reproduction? _________________________
Which process can be used a method of asexual reproduction?__________________
that produces gametes by mitosis.
The gametophyte produces gametes
that fuse and give rise to the diploid phase.