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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 . - PowerPoint PPT Presentation
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Domain Eukarya
Kingdom Protista
Kingdom Fungi
Kingdom Plantae
Most unicellular, some colonial
Lack strong tissue development
Aqueous, marine, or very humid environments
Mostly multicellular, all heterotrophs(yeast = unicellular)
Obligate symbionts
Cell walls contain chitin
Hyphae, mycelium
Found in air, water, & terrestrial habitats
Decomposers
Multicellular autotrophs (photosynthesis)
Chlorophyll
Cell walls contain cellulose
Nonmotile
Adapted for life on land
Alternation of generations
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.
Review
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.
Plants have two generations in their life cycle:
• Gametophyte: haploid, gamete-producing phase.
• Sporophyte: diploid spore-producing phase.
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 fuse to form a diploid zygote.
• Zygotes differentiate by mitosis into multicellular, diploid individuals.
(Sporophytes)
(Sporophyte)
Plants are grouped by:• morphology
• +/- & arrangement of vascular tissues (xylem & phloem)
• life cycle
Kingdom PlantaePhylum 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
Dicots Monocots# Floral parts
# Cotyledons
Leaf venation
Stem vascular bundles
Secondary growth
Angiosperms
Complete Flowers (monoecious)
• Bisexual or hermaphroditic
Incomplete Flowers (dioecious)
• Staminate (male)
• Pistilate (female)