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Genetics
n/a
49
Biology
Undergraduate 1
11/06/2008

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Term
Homozygous
Definition
2 identical alleles for a given gene
Term
Heterozygous
Definition
2 different alleles for a given gene
Term
Dominant
Definition
In a heterozygote the allele that decides the phenotype
Term
Recessive
Definition
In a heterozygote the allele that has no visible effect on the phenotype
Term
Incomplete Dominance
Definition
Type of inheritance where the phenotype is in between the 2 alleles of a heterozygote
Term
Codominance
Definition
The expression of 2 different alleles in a heterozygote
Term
Monohybrid Cross
Definition
The parents differ in one characteristic
Term
Dihybrid Cross
Definition
2 Characteristics are different
Term
P Generation
Definition
The parents
Term
F1 Generation
Definition
First generation
Term
F2
Definition
Second generation
Term
Gene
Definition
Discreet unit of hereditary information
Term
Allele
Definition
Alternative form of a gene
Term
Genotype
Definition
Genetic makeup of an organism
Term
Phenotype
Definition
Expressed traits of an organism
Term
Testcross
Definition
Mating of an individual genotype and an individual that is homozygous recessive for same characteristic
Term
Homologous Chromosomes
Definition
2 chromosomes that pair up in a diploid organism
Term
Pedigree Analysis
Definition
Studying the family tree for the occurrence of inheritable traits
Term
Autosome
Definition
Chromosome not directly involved in determining the sex of an organism
Term
Sex Chromosome
Definition
Chromosome that determines the sex
Term
Sex linked trait
Definition
Trait that is tied to a sex chromosome
Term
Carrier
Definition
Individual that is heterozygous, doesn't show phenotype for recessive gene but will pass it on.
Term
Pleitrophy
Definition
Control of more than one phenotype by one gene
Term
Polygenic Trait
Definition
More than one gene controlling a characteristic
Term
Linked Genes
Definition
Genes located close together that are inherited together
Term
Who is Gregor Mendel
Definition
First to study patterns of inheritance without DNA
Term
Mendel's law of segregation
Definition
Sperm/Eggs only carry one allele for a characteristic
Term
Law of independent assortment
Definition
Inheritance of one characteristic has no effect on another
Term
Complete Dominance
Definition
Only one allele is expressed
Term
Incomplete Dominance
Definition
Phenotype is mixed between the 2 parents
Term
Codominance
Definition
Expression of 2 different genes in a heterozygote
Term
Nucleic Acid
Definition
Polymer consisting of many nucleotides
Term
Nucleotide
Definition
5 carbon sugar bonded with a phosphate and a nitrogen base
Term
Transcription
Definition
DNA to RNA
Term
Translation
Definition
RNA to Amino Acid
Term
Genetic Code
Definition
Set of rules that gives the information to the protein
Term
Codon
Definition
3 bases that match with the an amino acid
Term
Mutation
Definition
Change in the genetic code
Term
Base substitution mutation
Definition
one base is substituted for another
Term
Base insertion or deletion mutation
Definition
A base goes away or a new one is added
Term
Mutagen
Definition
Thing that causes a mutation
Term
Virus
Definition
Genes in a sack that can infect cells
Term
Structure of the DNA molecule
Definition
Sugar phosphate backbone with bases. 2 strand joined together at bases to form a double helix
Term
Base pairs
Definition
A=T/U
G=C
Term
Why is base complementarity important?
Definition
It enables the DNA to replicate and for RNA to be transcribed
Term
Trancription
Definition
RNA polymerase starts at a promoter then works it's way down the DNA, first unzipping the section then matching up the bases. It stops at a terminator
Term
Translation
Definition
mRNA meets up with tRNA in a ribosome. Then an anti Codon in the tRNA matches with a Codon in mRNA. Then the tRNA finds the corresponding amino acid
Term
2 ways mutations are harmful
Definition
Change the amino acid order making a protein useless

Cause cancer
Term
2 ways mutations are helpful
Definition
Creates diversity

Enables researchers to create different alleles
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