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Biology Chapters 6-9
Exam 2
32
Biology
Undergraduate 2
10/24/2011

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Term
Photosynthesis
Definition
Conversion of solar energy into chemical energy.
Term
Chloroplast
Definition
The organelle responsible for photosynthesis.
Term
Thylakoid
Definition
Light dependent reactions; membranous sacs in the chloroplast.
Term
Stroma
Definition
Carbon capture; fluid in the chloroplast.
Term
Chlorophyll
Definition
Chlorophyll (also chlorophyl) is a green pigment found in almost all plants, algae, and cyanobacteria.
Term
Mitochondria
Definition
An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
Term
Cellular Respiration
Definition
Cellular respiration is the set of the metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into ATP.
Term
Fermentation
Definition
Term
Cell Division
Definition
A parent cell gives rise to two daughter cells.
Term
Binary Fission
Definition
Splitting of a bacteria cell into two cells.
Term
Karyotype
Definition
Entire set of stained chromosomes from a single cell.
Term
Histones
Definition
Proteins that tightly wind DNA, etc.
Term
Chromatin
Definition
Chromatin is the combination of DNA and proteins that make up the contents of the nucleus of a cell.
Term
Homologous Chromosomes
Definition
Homologous chromosomes are chromosomes that contain the same genes, but may have different alleles for those genes. In a homologous pair, one chromosome comes from the mother and the other from the father.
Term
Sister Chromatids
Definition
Sister chromatids are 2 identical copies of a chromatin connected by a centromere; contain the same genes.
Term
Diploid
Definition
Organism with two of each chromosome; one inherited from the mother and another from the father.
Term
Cytokinesis
Definition
Cell division.
Term
Crossing Over
Definition
Occurs during Prophase 1; homologous chromosomes pair and exchange genetic material during this phase.
Term
Gene
Definition
A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic.
Term
Allele
Definition
An allele is an alternative form of a gene (one member of a pair) that is located at a specific position on a specific chromosome.
Term
Homozygous
Definition
Having identical alleles.
Term
Heterozygous
Definition
Not having identical alleles.
Term
True Breeding
Definition
A true breeding organism, sometimes also called a pure-bred, is an organism having certain biological traits which are passed on to all subsequent generations when bred with another true breeding organism for the same traits.
Term
Dominant Allele
Definition
An allele that produces the same phenotype whether its paired allele is identical or different.
Term
Recessive Allele
Definition
An allele that produces its characteristic phenotype only when its paired allele is identical.
Term
Genotype
Definition
The genetic makeup of an organism or group of organisms with reference to a single trait, set of traits, or an entire complex of traits.
Term
Phenotype
Definition
The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
Term
Incomplete Dominance
Definition
Dominance in genetics is a non-linear relationship between different forms (alleles) of a gene and the resultant phenotype.
Term
Codominance
Definition
Heterozygote expresses the phenotype of both homozygotes.
Term
Carrier
Definition
A genetic carrier (or just carrier), is a person or other organism that has inherited a genetic trait or mutation, but who does not display that trait or show symptoms of the disease.
Term
X Inactivation
Definition
X-inactivation (also called lyonization) is a process by which one of the two copies of the X chromosome present in female mammals is inactivated.
Term
Polygenic Trait
Definition
A polygenic trait is a trait controlled by many (poly) genes.
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