alleles: Specific
locations on DNA carrying information for contrasting forms of the same
trait (e.g., blue eyes and brown eyes) (I.1.4.2).
allopatric: Living
in different areas (I.1.5.1).
anaerobic cell:A
cell that grows only in the absence of oxygen, i.e., it derives its energy
by fermenting nutrients in the absence of oxygen (I.3.3.l.b).
archosaurian reptiles:Ruling
reptiles that are specialized toward bipedal life; the dinosaur is the
famous example. They were the dominant land reptiles in the Mesozoic era.
Today they survive only in the form of aberrant crocodiles and alligators
(I.2.2.2).
cataclysmic flood:The
flood recorded in Genesis 6-9. It was a universal, sudden, and violent
deluge that covered the whole earth and wiped out all the land animals
(II.6.1.1).
Cavendish balance:A
device invented by Rev. John Mitchell but first used by Sir Henry Cavendish
in 1798 to measure the force of gravitational attraction between two bodies.
It consists of alight, rigid T-shaped member supported by a fine vertical
fiber. Two spheres with known mass are mounted at the ends of the horizontal
portion of the T, and a small mirror fastened to the vertical portion reflects
a beam of light onto a scale. To use the balance, two large spheres with
gravitational attraction to the small spheres mounted on the balance are
brought to juxtaposition with the latter. The forces of gravitational attractions
between the large and small spheres result in the twisting of the system
through a small angle, thereby moving the reflected light beam along the
scale (I.3.1).
clone: A
group of cells with identical genetic make-up (I. 1.3).
colinearity: The
exact correspondence between the nucleotide sequence on the DNA with the
amino acid sequence on the polypeptide encoded by the DNA; e. g., a mutation
on the DNA code will change the amino acid to be inserted into a corresponding
site on the polypeptide (I.3.3.1.d).
colony: An
area of bacterial growth on an agar plate containing millions of bacterial
cells of the same genetic make-up (I.1.3).
cornified: Hardened
(I.2.5.2.c).
dimorphism: Distinctness in structure and appearance usually associated with the different sex role of male and female; e.g., differences between man and woman, both being in the same species (I.1.2).
echinoderm: A
member of the phylum Echinodermata (spiny-skinned animals such as sea stars,
sea urchins, and sea cucumbers) (I.2.5.3)
[315]
endemic: Regularly
found in a particular locality (I.2.4).
fidelity: Accuracy,
exactness (I.2.6.1).
formal: Having
to do with form (I.2.3.3).
genetic polymorphism:The
existence of two or more forms of individuals in the same species. These
forms have detectable differences that are controlled genetically; e.g.,
the human blood groups (I.1.2).
geological column:A
geological timetable that divides the earth's history into the Precambrian,
Paleozoic, Mesozoic, and Cenozoic eras characterized by various fossilized
plants and animals. The age of the rocks found in each era was estimated
by both radiometric and nonradiometric methods (I.2.1.2).
geological time scale:Each
geological stratum in the earth's crust (geological column) has been correlated
with quantitative measurements of radiometric data, resulting in the construction
of a geologic time scale (I.1.5; 2.1.2.b.4).
haploid: Having
a single set of chromosomes per individual or cell, as in gametes (I.1.2).
heliocentric:
Referring to the view that the sun is the center of the solar system. This
view challenged the medieval belief that the earth was the center of the
universe. It was first promulgated by Copernicus and later elaborated by
Galileo and Kepler (II.4.2.1).
homology: A
similarity of specific organs of living members of an animal group, albeit
with slight or marked modification, to corresponding organs in their presumed
common ancestor (I.2.3.1).
lymphocytes: White
blood cells of a certain type produced in the bone marrow that are involved
in the immune system of the body (I.2.5.2.d).
lymphoid tissue:Tissue
that is rich in lymphocytes. Some of the lymphoid tissues in the body are
the thymus, the lymph nodes, the spleen, and the bone marrow (I.2.5.2.d).
macrogenesis (saltation):
A sudden change in the genetic make-up of an organism leading to a new
species (I.1.5.1).
manus: The
proximal part of the hand below the radius and ulna bones (I.2.2.2).
marsupial: Pertaining
to mammals whose young are born quite early in development and complete
their development attached to a nipple in the mother's marsupium, or pouch
(I.2.4).
mechanistic: Referring
to the theory that everything in the universe is produced by matter in
motion; materialism (I.4.3.3).
meiosis: A
process involved in sexual reproduction in which the number of chromosomes
is reduced by half (I.1.4.2).
[316]
musculature: The
muscular system (I.2.3.3).
mutator locus:A
region of DNA in certain bacteria and bacteriophage (virus) that has been
known to produce DNA polymerase, the enzyme responsible for the replication
process of DNA. Mutations in this region of the DNA alter the behavior
of this enzyme, leading to an increase in the spontaneous mutation rate
for all detectable genetic loci due to base mispairing (I.2.6.3.[3]).
neonatal thymectomy:The
surgical removal of the thymus from a newborn (I.2.5.2.d).
neontologist:A
developmental biologist (I.2.2.2).
occipital: Pertaining
to the back part of the head or skull (I.2.3.3).
organic infusions:Liquid
extracts (of meat vegetable, or any other kind of organic matter) that
contain an abundance of nutrients for growth of microorganisms (I.3.3.1.a).
outcrossing: Outbreeding,
mating with genetically unrelated individuals (I.2.6.5).
phagocytic cells:Cells
that are capable of phagocytosis (I.3.2.1.c). (See definition of
phagocytosis, I.2.6.)
phagocytosis:The
process by which certain cells such as the leukocytes (white blood cells)
engulf large particles into a sac or membrane-bound vacuole in the cell
(I.2.6.1).
phenotypic: Pertaining
to the structural and functional appearance of an organism that results
from the interaction of genes with one another and with the environment
(I.3.2.2.c).
phylogenetic:Pertaining
to the presumed evolutionary relationship (I.2.2.1. b).
placental: Pertaining
to mammals that carry their young in the mother's uterus where they receive
food and oxygen via the placenta until a fairly advanced stage of development
(I.2.4).
point-mutations:Changes
in the DNA molecules that are confined to single base (i.e., adenine, guanine,
cytosine, or thymine) (I.1.5).
polyploidy:
Possession of more than two complete sets of chromosomes (I.1.5.1).
sagittal: Vertical
and
lengthwise from snout to tail in the body as in sagittal section (I.2.3.3).
saltation (macrogenesis):
Sudden change in the genetic make-up of an organism leading to a new species
(I.1.4.1; I.5.1).
spatial: Pertaining
to space (I.2.3.3).
sympatric: Living
in the same area (I.1.5.1).
synapse: The
pairing up of homologous chromosomes during meiosis (see I.2.66,
Figure 2.62) (I.3.3.1.c).
[317]
taxon (pl. taxa):
One of the hierarchical categories in which organisms are classified, i.e.,
species, order, class, etc. (I.2.2.1.b).
temporal: Pertaining
to time (I.2.3.3).
thymus: A
lymphocyte-rich organ located in the chest behind the top of the breast
bone; important in the production and maintenance of immune cells (I.2.5.3).
tundra: A
treeless terrestrial communi8ty north of the arctic circle (I.2.4, Figure
2.25).
universal cataclysm:A
world-wide, sudden, and violent flood (Genesis 6?9) that covered the whole
earth and wiped out all land animals (II.7.1.l).
enous blood: Blood
that flows from the peripheries of the body toward the heart via the veins;
it is usually deoxygenated (I.2.5.2.c).
young earth: The view that the universe was created in six solar days so that the earth is only 10,000 to 20,000 years old (II.6.1.1).