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Integrated Principles of Zoology, 15/e
Cleveland P. Hickman, Jr.
Allan Larson
David Eisenhour
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CHAPTER 1
Life: Biological
Principles and the
Science of Zoology
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The Uses of Principles

Zoology:
The scientific study of animal life

Exploration of the animal world is
gained by actively applying important
guiding principles to our investigations

Exploration of the animal world
depends critically on our questions,
methods, and principles
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The Uses of Principles

Principles of modern zoology come
from:
Laws of physics and chemistry
 Scientific method


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Because life shares a common
evolutionary origin, principles learned
from the study of one group often
provide insight to other groups as well
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Fundamental Properties of Life

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Does Life Have Defining Properties?
 What is life?
 No simple definition
 The history of life shows extensive
and ongoing change called
evolution
 Answer must be based on the
common history of life on earth
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Fundamental Properties of Life
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
This common history can be traced
backward through time from the diverse
forms observed today and in the fossil
record to their common ancestor that
arose almost five billion years ago

Life's history of descent with modification
gives it an identity and continuity that
separates it from the nonliving world
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General Properties of Living Systems

Chemical Uniqueness:
Living systems demonstrate a unique
and complex molecular organization

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Small molecules are assembled into
macromolecules:
1. Nucleic Acids
2. Proteins
3. Carbohydrates
4. Lipids
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General Properties of Living Systems
 Although
living systems are
composed of the same kinds of
atoms obeying the same
fundamental laws of chemistry as
nonliving matter, the organizational
structure of the macromolecules
makes them unique
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General Properties of Living Systems

Complexity and Hierarchical
Organization:
Living systems demonstrate a unique
and complex hierarchical organization

In living systems there exists a
hierarchy of levels that includes:
Macromolecules
Cells
Organisms
Populations
Species
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General Properties of Living Systems

Emergence: A appearance of new
characteristics at a given level of
organization

These characteristics are called
emergent properties

Different levels of the biological
hierarchy and their particular emergent
properties are built by evolution
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General Properties of Living Systems

Reproduction:
Living systems can reproduce
themselves

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At each level of the biological hierarchy
living forms reproduce to generate others
like themselves:
 Genes replicate to produce new genes.
 Cells divide producing new cells.
 Organisms reproduce, sexually or
asexually, to produce new organisms
 Populations fragment to produce new
populations
 Species split to produce new species
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General Properties of Living Systems

Possession of a Genetic Program:
A genetic program provides fidelity of
inheritance
Nucleic Acids: Encode structures of the
protein molecules needed for organismal
development and functioning
 DNA: Long, linear, chain of nucleotides
 Stores genetic information
 Genetic Code: correspondence between
base sequences in DNA and the sequence
of amino acids in a protein

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General Properties of Living Systems

Metabolism:
Living organisms maintain themselves
by acquiring nutrients from their
environments
 Metabolic processes include:
 Digestion
 Energy
production (Respiration)
 Synthesis of required molecules and
structures by organisms
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General Properties of Living Systems

Metabolism is an interaction of
destructive (catabolic) and constructive
(anabolic) reactions

The most fundamental anabolic and
catabolic chemical processes used by
living systems arose early in the
evolutionary history of life
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General Properties of Living Systems

Development:
All organisms pass through a
characteristic life cycle
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Development describes the characteristic
changes that an organism undergoes from
its origin to its final adult form
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General Properties of Living Systems

Environmental Interaction:
All animals interact with their
environments
Ecology: The study of organismal
interaction with an environment
 All organisms respond to environmental
stimuli, a property called irritability

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General Properties of Living Systems

Movement:
Living systems and their parts show
precise and controlled movements
arising from within the system
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Living systems extract energy from their
environments permitting the initiation of
controlled movements
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General Properties of Living Systems
Movements at the cellular level are
required for:
Reproduction
Growth
Responses to stimuli
Development in multicellular organisms
 On a larger scale:
Entire populations or species may
disperse from one geographic location
to another over time
 Movement of nonliving matter:

Not precisely controlled by the moving objects
 Often involves external forces

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Life Obeys Physical Laws

First Law of Thermodynamics (Law of
Conservation of energy):
Energy is neither created nor destroyed
but can be transformed from one form
to another
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All aspects of life require energy and its
transformation
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Life Obeys Physical Laws

Second Law of Thermodynamics
Physical systems tend to proceed toward a
state of greater disorder or entropy


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The ultimate fate of materials in cells is
degradation and dissipation of their chemical
bond energy as heat
Organismal complexity is achieved and
maintained only by the perpetual use and
dissipation of energy flowing into the biosphere
from the sun
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Life Obeys Physical Laws
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
The complex molecular organization in
living cells is attained and maintained only
as long as energy fuels the organization

Survival, growth, and reproduction of
animals require energy that comes from
breaking complex food molecules into
simple organic waste
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Zoology As Part of Biology


Animals originated in the Precambrian
seas over 600 million years ago
Characteristics of Animals:
Eukaryotes: cells contain membraneenclosed nuclei
 Heterotrophs: Not capable of
manufacturing their own food and must
rely on external food sources
 Cells lack cell walls

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Principles of Science

Nature of science:
Science is guided by natural law
 Science has to be explained by reference
to natural law
 Science is testable against the observable
world
 The conclusions of science are tentative
and therefore not necessarily the final
word
 Science is falsifiable

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Principles of Science

Scientific Method

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Hypothetic-deductive Method:
Scientific process of making a conjecture
and then seeking empirical tests that
potentially lead to its rejection
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Principles of Science
 Hypothesis:
 Potential
answers to questions being
asked
 Derived from prior observations of
nature or from theories based on such
observations
 Often constitute general statements
about nature that may explain a large
number of diverse observations
 If a hypothesis is very powerful in
explaining a wide variety of related
phenomena, it attains the level of a
theory
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Principles of Science

The scientific method may be
summarized as a series of steps:
1.
2.
3.
4.
Observation
Question
Hypothesis Formation
Empirical Test
 Controlled Experiment
Includes at least 2 groups
Test Group
Control Group
5. Conclusions
Accept or reject your hypothesis
6. Publications
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Principles of Science


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Powerful theories that guide extensive
research are called paradigms
The refutement and replacement of a
paradigm is known as a scientific
revolution
Two major paradigms that guide
zoological research:
1. Darwin’s Theory of Evolution
2. The Chromosomal Theory of
Inheritance
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Principles of Science

Experimental vs. Evolutionary Sciences
 Experimental
 Seek
Sciences:
to explain the proximate or
immediate causes that underlie the
functioning of biological systems at a
particular time and place
 Goal: To explain how animals perform
metabolic, physiological, and behavioral
functions at the molecular, cellular,
organismal, and populational levels
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Principles of Science
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
Example:
 How is genetic information expressed to
guide the synthesis of proteins?
 What signal causes cells to divide to
produce new cells?
 How does population density affect the
physiology and behavior of organisms?

Experimental Sciences:
Molecular Biology, Cell Biology,
Endocrinology, Developmental Biology
Community Ecology
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Principles of Science
 Evolutionary
Sciences:
 Seek
to address questions of ultimate
causes and rely largely on the use of the
comparative method rather than
experimentation
 Ultimate
Cause: The evolutionary
factors responsible for the origin, state
of being, or purpose of a biological
system
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Principles of Science
 Molecular
biology, cell biology,
organismal structure, development, and
ecology are compared among related
species to identify patterns of variation
 Patterns
of similarity and dissimilarity
are used to test hypotheses of
relatedness
 This
information is used to reconstruct
the evolutionary tree that relates to the
species being studied
 Rely
on experimental sciences as a
starting point
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Principles of Science

Example:
 Why do different species of animals
have different numbers of
chromosomes in their cells?
 Why do some animal species maintain
complex social systems, whereas other
species have solitary individuals?
 Evolutionary
Sciences:
Comparative Biochemistry,
Molecular Evolution, Comparative
Cell Biology, Comparative Anatomy,
Comparative Physiology, and
Phylogenetic Systematics
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Theories of Evolution and Heredity

Darwin’s Theory of Evolution
Over 150 years old
 Published in On the Origin of Species by
Means of Natural Selection in England in
1859
 Darwinism encompasses several different,
although mutually compatible theories

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Theories of Evolution and Heredity

Ernst Mayr (Harvard University)
proposed that Darwinism should be
viewed as five major theories:
1.
2.
3.
4.
5.
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Perpetual Change
Common Descent
Multiplication of the Species
Gradualism
Natural Selection
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Theories of Evolution and Heredity

Perpetual Change
The living world is neither constant nor
perpetually cycling, but is always
changing
 The varying forms of organisms undergo
measurable change across generations
throughout time
 Documented by the fossil record
 Theory upon which the remaining 4 are
based
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Theories of Evolution and Heredity

Common Descent
All forms of life descend from a common
ancestor through a branching of lineages
Life’s history has the structure of a
branching evolutionary tree, known as a
phylogeny
 Serves as the basis for our taxonomic
classification of animals

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Theories of Evolution and Heredity

Multiplication of Species
The evolutionary process produces new
species by splitting and transforming
older ones
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Theories of Evolution and Heredity

Gradualism
Large differences in anatomic traits that
characterize disparate species originate
through the accumulation of many small
incremental changes over very long
periods of time
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Theories of Evolution and Heredity

Natural Selection
A creative process that generates novel
forms from the small individual variations
that occur among organisms within a
population
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Adaptation
An anatomical structure, physiological
process, or behavioral trait that evolved
by natural selection and improves an
organism’s ability to survive and leave
descendants
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Theories of Evolution and Heredity

Darwin's theory of natural selection
faced a major obstacle when first
proposed because it lacked a
successful theory of heredity

Neo-Darwinism
Describes Darwin’s theories as modified
by incorporating the Chromosomal Theory
Of Inheritance
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Theories of Evolution and Heredity

Mendelian Heredity and the
Chromosomal Theory of Inheritance
Foundation for current studies of genetics
and evolution in animals

Genetic Approach
Mating populations of organisms that are truebreeding for alternative traits
 Following hereditary transmission of those
traits to offspring


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Contributions of Cell Biology
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