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General Biology: Animal Characteristics and Biodiversity

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  • What defines animals as a monophyletic group?
    Animals are monophyletic, originating from a common ancestor, characterized by movement under their own power and ingestion of food.
  • What is the significance of gene expression in multicellular animals?
    Different cell types exist due to gene expression, allowing specialization and coordination within multicellular animals.
  • What are the general characteristics of animals?
    Animals have tissues, show bilateral symmetry, exhibit cephalization (concentration of sensory organs at the head), and have a central nervous system.
  • Define biodiversity.
    Biodiversity is the variety and variability of life on Earth, characterized by species richness, evenness, and genetic variation.
  • What is alpha diversity?
    Alpha diversity measures the number of species in a given area or ecosystem; it is a simple, quick measure of species richness.
  • What does species evenness measure?
    Species evenness measures the relative abundance of different species in a community, indicating how evenly individuals are distributed among species.
  • What is gamma diversity?
    Gamma diversity quantifies the total number of species across multiple habitats or ecosystems.
  • What is phylogenetic diversity?
    Phylogenetic diversity measures how much evolutionary history is represented in a community, based on the length of branches on a phylogenetic tree.
  • What is functional diversity?
    Functional diversity measures the variety of ecological roles, traits, and functions of organisms within a community.
  • What major evolutionary events shaped life on Earth?
    Key events include the origin of life (~3.5 bya), eukaryotes, multicellularity, land colonization, vertebrates, dinosaurs, mammals, and flowering plants.
  • How do organisms adapt to their environment?
    Organisms adapt through evolutionary processes to different environmental conditions, leading to trait variation and ecological specialization.
  • What is ecological opportunity in evolution?
    Ecological opportunity occurs when new niches or resources become available, allowing species to diversify and adapt.
  • What causes mass extinctions?
    Mass extinctions are caused by rapid environmental changes, habitat loss, climate change, and other factors leading to high species loss.
  • What is the fundamental niche of a species?
    The fundamental niche is the full range of environmental conditions and resources a species can potentially use.
  • What is realized niche?
    The realized niche is the actual conditions and resources a species occupies, often limited by competition and other factors.
  • How do humans impact biodiversity?
    Humans cause habitat loss, species invasions, climate change, overexploitation, and fragmentation, leading to biodiversity decline.
  • Why are small populations vulnerable?
    Small populations are vulnerable to ecological impacts, genetic drift, inbreeding depression, and random events, increasing extinction risk.
  • What is the extinction vortex?
    The extinction vortex is a downward spiral where small population size leads to genetic and demographic problems, increasing extinction risk.
  • What conservation strategies help prevent extinction?
    Conservation includes habitat improvement, increasing population size, restoring connectivity, captive breeding, and managing genetic diversity.
  • What is adaptive radiation?
    Adaptive radiation is rapid diversification of a single lineage into many species exploiting different ecological niches.
  • What role does coevolution play in biodiversity?
    Coevolution drives reciprocal evolutionary changes between interacting species, promoting diversification and specialization.
  • What is species richness?
    Species richness is the count of different species present in a given area or community.
  • What is the difference between decomposers and consumers?
    Decomposers break down dead organic matter, while consumers ingest and digest food.
  • What is cephalization?
    Cephalization is the concentration of sensory organs and nervous tissue at the anterior end (head) of an animal.
  • What is bilateral symmetry?
    Bilateral symmetry means the body can be divided into mirror-image halves along one plane.
  • What is the significance of sponges in animal evolution?
    Sponges are simple animals with no true tissues, representing an early branch in animal evolution.
  • What is the importance of gene flow in conservation?
    Gene flow maintains genetic diversity and reduces inbreeding, helping population resilience.
  • What is inbreeding depression?
    Inbreeding depression is reduced fitness due to increased homozygosity and expression of deleterious alleles.
  • What is the role of habitat fragmentation?
    Habitat fragmentation breaks ecosystems into smaller patches, reducing connectivity and increasing species vulnerability.