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Domain Eukarya

Domain Eukarya. Review. Haploid: having 1/2 the number of chromosomes. Diploid: having a full complement of chromosomes (2n). Meiosis: cell division where chromosome number is reduced from diploid to haploid .

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Domain Eukarya

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  1. Domain Eukarya

  2. Review Haploid: having 1/2 the number of chromosomes. Diploid: having a full complement of chromosomes (2n). Meiosis: cell division where chromosome number is reduced from diploid to haploid. Fertilization: nuclei of two gametes fuse, raising the chromosome number from haploid to diploid.

  3. Your life cycle: • You are diploid. • Your cells produce haploid gametes through meiosis. • Your gametes fuse with someone else’s to form a diploid zygote. • The zygote differentiates by mitosis into a multicellular, diploid individual.

  4. Plants have two generations in their life cycle: • Gametophyte: haploid, gamete-producing phase. • Sporophyte: diploid spore-producing phase.

  5. In plants, generations alternate: • A diploid individual produces haploid spores by meiosis. • Spores divide by mitosis, producing multicellular haploid gametophytes (e.g. Pollen grain). • Gametophytes produce gametes that fuseto form a diploid zygote. • Zygotes differentiate by mitosis into multicellular, diploid individuals. (Sporophyte) (Sporophytes)

  6. Plants are grouped by: • morphology • +/- & arrangement of vascular tissues (xylem & phloem) • life cycle

  7. Kingdom Plantae Phylum Bryophyta (Mosses, liverworts, hornworts)No vascular tissuesRestricted in size and by habitatGametophyte = dominant phase Ferns & allies+ vascular tissuesSeedlessSporophyte = dominant phase Phylum Gymnosperma (Conifers, cycads, ginkgos, gnetophytes)+ vascular tissues Heterosporous: m/f conesSporophyte = dominant phase Phylum Anthophytha (Angiosperms, or flowering plants)+ vascular tissuesSpeciose, mutualisms, short generation times Sporophyte = dominant phase

  8. Angiosperms Dicots Monocots # Floral parts # Cotyledons Leaf venation Stem vascular bundles Secondary growth

  9. Complete Flowers (monoecious) • Bisexual or hermaphroditic • Incomplete Flowers (dioecious) • Staminate (male) • Pistilate (female)

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