jueves, 3 de marzo de 2011

Vocabulary Chapter 11

My scientific studies have afforded me great gratification; and I am convinced that it will not be long before the whole world acknowledges the results of my work. -Gregor Mendel

Allele
is one of two or more forms of the DNA sequence of a particular gene.

codominance
 refers to a relationship between two alleles of a gene.

 Continous Variation
Of a population, a more or less continuous range of small differences in a given trait among its individuals.





Dihybrid Cross
is a cross between F1 offspring (first generation offspring) of two individuals that differ in two traits of particular interest.




epistasis
Interaction between the products of two or more gene pairs.


F1
The offspring of the initial genetic cross.



F2
The offspring of parents that are the first filial generation from a genetic cross


Gene
is a unit of heredity in a living organism.

Genotype 
is the genetic makeup of a cell, an organism, or an individual.



Heterozygous
When cells of diploid organism contain two different alleles of a gene.


Homozygous Dominant  
That it has two dominant alleles.


Homozygous Recessive
A same trait that is not the stronger trait which is dominant.
 Hybrid Offspring
Offspring of crosses between parents with different traits.


Incomplete Dominance
Is a form of intermediate inheritance in which one allele for a specific trait is not completely dominant over the other.
Independent Assortment
States that allele pairs separate independently during the formation of gametes.
Monohybrid Cross
Is a cross between two parents that breed true for different versions of a single trait. 
Multiple Alelle System
A "variation" of a gene.Genes which have more than two alleles

Phenotype
Is any observable characteristic or trait of an organism.
Pleiotropy
Is the condition in which a gene influences the phenotype of more than one part of the body.
Probability 
The chance that each outcome of a given event will occur is proportional to the number of ways the outcome can be reached.

Punnet-square Method
A way to predict probable outcomes of a genetic cross.

Segregation 
States that allele pairs separate during gamete formation, and randomly unite at fertilization.

Testcross
A cross between an individual with an unknown genotype and an individual with the homozygous recessive genotype.
True-breeding lineage
Occurs when offspring inherited identical alleles, generation after generation.