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Biology Study Guide 3
For Exam 3
72
Biology
Undergraduate 1
03/06/2011

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Term
Allele
Definition
A molecular form of a gene, a chromosome one from each parent
Term
Chromosome
Definition
A continuous strand of dna
Term
Genotype
Definition
Genetic constitution of an organism
Term
Phenotype
Definition
physical appearance, expressed or shown(The expressed trait of an organism).
Term
Mutation
Definition
A change in the molecular structure of DNA
Term
Dominate
Definition
A dominate allele masks the effect of a trait. Represented by a capitol A
Term
RECESSIVE
Definition
The trait of a recessive allele allele is masked by that of a stronger or dominate trait
Term
Haploid
Definition
The chromosome number of 1n
Term
Diploid
Definition
The chromosome number of 2n. A pair of genes
Term
Hybrid
Definition
Offspring from two different breeding varieties
Term
Character
Definition
A heritable trait that varies among individuals
Term
Trait
Definition
a variation of the heritable trait. Difference in character
Term
P
Definition
True breeding parents
Term
F1
Definition
The offspring of two parental (p generation)individuals
Term
F2
Definition
2nd generatio,self crossed from f1, second filial
Term
Heterozygous
Definition
Pairing of nonidentical alleles
Term
Homozygous
Definition
Two identical alleles for a single gene
Term
Homozygous Dominate
Definition
AA
Term
Homozygous Recessive
Definition
aa
Term
Heterozygous Dominate
Definition
Aa
Term
Monohybrid Cross
Definition
Cross between parents that differ in only one character
Term
Dyhybrid Cross
Definition
A mating of individuals differing at two genetic Loci
Term
Pleitrophy
Definition
The impact of more than one phenotypic character by a single gene
Term
Polygenic Inheritance/Epistasis
Definition
The phenotypic trait arises from the product of two or more gene pairs when one gene masks teh action of the other
Term
Concordance
Definition
The degree of which a genetic trait may be inherited
Term
Homologous chromosomes
Definition
Two chromosomes that make a matched pair, 1 from father,1 from mother
Term
Loci
Definition
The particular site where genes are formed on chromosomes
Term
Testcross
Definition
A phenotypical unknownn is crossed with a known homozygous recessive organism
Term
Segregation
Definition
Two alleles for a heritable trait segregate during gamete formation and end up in different gametes
Term
Mendells Law of segrgation
Definition
During Meiosis Two, 2 alleles for each trait are seperated
Term
mendells 2nd LAw
Definition
Law of independent assortment, The effect of one character has no effect of another
Term
Recessive Disorder
Definition
A lethal genetic disease,which results from inheriting two defective recessive alleles of a gene, one from each parent
Term
Dominant Disorders
Definition
The parent has a single defective gene which dominates its normal counterpart, the offspring have a fifty percent chance of inheriting the faulty gene and disorder
Term
Two dominant disorders
Definition
Alzheimers & Huntingtons
Term
Sex linked gene
Definition
Any gene located on the X chromosomes
Term
Sex linked disorders
Definition
Any gene or abnormality that is determined by sex hormones, due toi recessive alleles, mostly in males
Term
Transrciption
Definition
The synthesis od RNA on a DNA template
Term
Translation
Definition
The transfer of information into a protein
Term
Duplication Point Mutation
Definition
Unequal crossover allowing a segment to be repeated, AABC XYZ
Term
Deletion Point Mutation
Definition
Some chromosomal information is lost A_C XYZ
Term
Inversion Point Mutation
Definition
A sequence of the gene is backwards ABC YXZ
Term
Translation Mutation
Definition
A broken piece of a chromosome attaches to another chromosome, YXZ ABC
Term
Mutagen
Definition
Chemical or physical agent that interacts with DNA and causes a mutation
Term
Describe a virus, Why is it not considered alive?
Definition
A nonliving chunk of DNA wrapped in a protein coatDoes not have all 5 characteristics of life
Term
Lytic Cycle
Definition
A viral reproduction cycle results inthe release of new viruses by breaking open the host cell
Term
Zoonosis
Definition
A virus moving or jumping to another species
Term
What is a prion
Definition
An infectious form of a protein thT MAY MULTIPLY BY CONVERTING PROTEINS TO MORE PRIONS
Term
How are prions transmitted
Definition
By ingestion
Term
Somatic cells
Definition
All but gametes, Any multicellular organism except a sperm or egg
Term
What is a vector
Definition
A piece of DNA, usually a plasmid or a viralgenome used to move genes from one cell to another
Term
Genetic engineering
Definition
The direct manipulation of genes for practical purposes
Term
What is a vaccine
Definition
A harmless variant of a disease causing microbes such as bacterium that is used to prevent infectious disease
Term
DNA profiling
Definition
a procedure that analyzes an individuals unique collection of genetic markers
Term
Macroevolution
Definition
The appearance of a new species over time
Term
Microevolution
Definition
Changes in the genes of a population
Term
Comparative Anatomy
Definition
The comparison of body structure in different species
Term
What is a gene pool
Definition
All genes in a population at any one time
Term
Hardy-Weinberg Equillibrium
Definition
A formula that can be used to calculate the frequency of genotypes in a gene pool from the frequencies of alleles
Term
Gene frequency
Definition
How often an allele is found in a population
Term
Geneti Drift
Definition
A change in the gene pool of a small population due to chance
Term
Bottleneck effect
Definition
A genetic drift resulting from a drastic reduction in population size
Term
Directional Selection
Definition
Acts in favor of the individuals at one end of a phenotype range
Term
Disruptive Selection
Definition
Favors extreme over intermediate phenotypes
Term
Stabalizing Selection
Definition
Favors intermediate variants by acting against exteme phenotypes
Term
Reproductive Barrier
Definition
Anything that prevents individuals of closely related species from interbreeding
Term
Prezygotic Barrier
Definition
Prevent mating or fertilization between species
Term
Postzygotic Barrier
Definition
Operates of interspecies mating occurs and results in hybrid zygotes
Term
Allopatric Speciation
Definition
The initial block to gene flow is a geographical barrier that physically isolates the splinter population
Term
Sympatric Speciation
Definition
The origin of a new species with out geographical isolation
Term
Gradual Equillibrium
Definition
Big changes occuring by the steady accumalation of many small changes
Term
What is EVO_ DEVO
Definition
Evolutionary Developmental Biology
Term
Geological Time
Definition
Reflection of a constant sequence of geological periods
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