Bio 101 Day 12

Bio 101 Day 12 - (Somatic MITOSIS(II(IIII(II...

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(Somatic) MITOSIS (II) (IIII) (II II) (II) (II) (diploid) 2n 4n 2n 2n (2n) (2n) (Gametes) MEIOSIS (I) (I) (IIII) (II) (II) (I) (I) (I) (I) (haploid) n n 4n 2n 2n n n n n (II)  2n Heterokonts: Golden Algae -Mostly unicellular, biflagellate freshwater and marine, some colonial -major component of tiny nanoplankton -Primarily asexual reproduction producing biflagellate motile spores called zoospores -Photosynthetic (chlorophylls and carotenoids) Heterokonts: Brown Algae -Multicellular heterokonts -Largest and most complex members (seaweed used in foods, thickenings) -Important in cooler ocean waters—habitat for many marine invertebrates, fishes and mammals -Alternating generations (haploid and diploid) Brown Algae Kelps (largest brown algae) Leaflike blades (photosynthetic) Stemlike stipes Anchoring Holdfasts Gas-Filled bladders for buoyancy
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Plants -Monophyletic group that now includes -red algae -green algae -land plants -Based on -molecular data -presence of chloroplasts bounded by outer and inner membranes Red and Green Algae -Red and Green Algae: -Chloroplasts containing chlorophyll (a) and (b) plus carotenoids -Reproduction involves both asexual and sexual reproduction—varied -Isogamous—two flagellate gametes identical in size -Anisogamous—two flagellate gametes of different sizes -Oogamous—nonmotile egg and flagellate male gamete Ulva Ulva alternates between haploid and diploid multicellular generations Gametes are either isogamous: two flagellate gametes identical in size Or anisogamous: two flagellate gametes of different sizes Depending on the species Chlamydomonas This unicellular haploid green algae alternates between haploid and a reduced diploid generation It has mating types (+) and (-) and is an example of isogamous sexual reproduction
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Spirogyra Between two haploid filaments Conjugation tubes form Contents of one cell pass into another Cells form diploid zygote—undergo meiosis to become haploid algae Red Algae -Mostly multicellular seaweeds
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Bio 101 Day 12 - (Somatic MITOSIS(II(IIII(II...

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