Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
The majority of traits are what? (gene number)
Gene - A gene is defined as a polynucleotide chain that consists of segments each controlling a particular trait.Genes are considered as a :-
1)Unit of function known as Cistron.
2)Unit of Mutation known as Mutan.
3)Unit of recombination known as recon
The trait is a character which we have inherited from our parents and then it will be passed to our children as gene,like this hereditary goes on succeeding.
Trait are of two types:-
A)GENOTYPIC TRAIT:- The genetic makeup of the organism is known as genotype.
B)PHENOTYPIC TRAIT:- The external appearance of the organism is known as its phenotype.
The most common genetic traits are:-
1)Presence of curly hair or silky hair.
2)Dimples on the chin
3)Ear shape etc.
The most common phenotypic traits are:-
1)Eye color
2)Hair color
3)Weight
4)Height.
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