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Characteristics of Animals

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Characteristics of Animals Section 27.1 Features of Animals: # 1: Heterotrophy & Mobility Animals cannot make their own food Most animals move to find food Food is ... – PowerPoint PPT presentation

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Title: Characteristics of Animals


1
Characteristics of Animals
  • Section 27.1

2
Features of Animals 1 Heterotrophy Mobility
  • Animals cannot make their own food
  • Most animals move to find food
  • Food is digested internally
  • Animals have the ability to make rapid, complex
    movements

3
Features of Animals, cont 2 Multicellularity
Tissues
  • All animals are made of many specialized cells
  • Animals are the only multicellular group without
    cell walls
  • All cells are roughly the same size, regardless
    of the size of the animal
  • Similar cells are organized into functional
    groups called tissues

4
Features of Animals, cont 3 Diploidy
Sexual Reproduction
  • Adults cells are diploid have 2 copies of each
    chromosome, 1 from each parent
  • Haploid gametes (sex cells with 1 set of
    chromosomes) unite to form offspring
  • The zygote (fertilized egg) is diploid
  • This allows for genetic diversity

5
Features of Animals, cont 4 Blastula
Formation
  • The zygote divides to form a hollow ball the
    blastula
  • Cells in the blastula develop three layers which
    then develop into different structures
  • Ectoderm skin, nervous system
  • Endoderm digestive respiratory systems
  • Mesoderm skeleton, muscular, circulatory,
    reproductive excretory systems

6
Animal Body Plans 1 Symmetry
  • Asymmetrical irregular in shape (sponges)
  • Radial symmetry like the spokes of a wheel (sea
    anemone)
  • Bilateral symmetry two equal sides (humans)
  • right left sides
  • dorsal (back) ventral (belly)
  • anterior (head) posterior (tail) ? cephalization

7
Animal Body Plans, cont 2 Internal Body
Cavity
  • Found in bilaterally symmetrical animals
  • Coelom the body cavity fluid-filled space
    between body wall gut protects the internal
    organs
  • Three plans
  • Acoelomate no coelom
  • Pseudocoelomate body cavity between the
    mesoderm and endoderm false coelom
  • Coelomate cavity within mesoderm allows for
    greater movement

8
Animal Body Plans, cont 3 Segmentation
  • Segments are repeating body units
  • All higher animals have some degree of
    segmentation (vertebrae)

9
Kinds of Animals
  • 35 phyla
  • Often divided into 2 major groups
  • Invertebrates (without backbones)
  • Vertebrates (with backbones)
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