Algae Reproduction

Alternation of Generations 1. Gametophyte Haploid (n) Meiosis produces spores that grow mitotically into a gametophyte Sexual reproduction Gametophyte produces gametes which fuse to form a zygote

2. Sporophyte Diploid (2n) Grows mitotically from zygote & uses meiosis to produce spores Asexual reproduction

Meiosis: Process that produces HAPLOID gametes from DIPLOID cells (2n  n)

Mitosis: Process by which cell division results in cells with the same number & kind of chromosomes as the parent cell (2n  2n OR n  n) Daughter cells are IDENTICAL to parent cell

Advantages of Alternation of Generations: Asexual reproduction allow a single organism to reproduce & colonize habitats quickly Sexual reproduction creates variation within the species which allows for: Survival of in changing habitats Resistance to pests Spores can become dormant which allows for survival in adverse conditions

Assignment: Read pp. 440-442 Worksheets on reproduction (x2)