● The idea that `color{Violet}"disorders are inherited"` has been prevailing in the human society since long.
● This was based on the `color{Violet}"heritability"` of certain characteristic features in families.
● After the rediscovery of Mendel’s work the practice of `color{Violet}"analysing inheritance pattern"` of traits in human beings began.
● Since it is evident that `color{Violet}"control crosses"` that can be performed in pea plant or some other organisms, are `color{Violet}"not possible"` in case of `color{Violet}"human beings"`, study of the `color{Violet}"family history"` about inheritance of a particular trait provides an alternative.
● Such an `color{Violet}"analysis of traits"` in a `color{Violet}"several of generations"` of a family is called the`color{Violet}" pedigree analysis"`.
● In the pedigree analysis the inheritance of a particular trait is represented in the `color{Violet}"family tree"` over generations.
● In `color{Violet}"human genetics"`, pedigree study provides a strong tool, which is utilised to `color{Violet}"trace the inheritance"` of a specific trait, abnormality or disease.
● Some of the important `color{Violet}"standard symbols"` used in the pedigree analysis have been given in the image below:
● Each and every `color{Violet}"feature"` in any organism is controlled by one or the other `color{Violet}"gene located on the DNA"` present in the chromosome.
● DNA is the `color{Violet}"carrier of genetic information"`. It is hence transmitted from one generation to the other without any `color{Violet}"change or alteration"`.
● However, changes or alteration do take place `color{Violet}"occasionally"`.
● Such an alteration or `color{Violet}"change in the genetic material"` is referred to as `color{Violet}"mutation"`.
● A number of `color{Violet}"disorders"` in human beings have been found to be associated with the `color{Violet}"inheritance"` of changed or `color{Violet}"altered"` `color{Violet}"genes or chromosomes"`.
● The idea that `color{Violet}"disorders are inherited"` has been prevailing in the human society since long.
● This was based on the `color{Violet}"heritability"` of certain characteristic features in families.
● After the rediscovery of Mendel’s work the practice of `color{Violet}"analysing inheritance pattern"` of traits in human beings began.
● Since it is evident that `color{Violet}"control crosses"` that can be performed in pea plant or some other organisms, are `color{Violet}"not possible"` in case of `color{Violet}"human beings"`, study of the `color{Violet}"family history"` about inheritance of a particular trait provides an alternative.
● Such an `color{Violet}"analysis of traits"` in a `color{Violet}"several of generations"` of a family is called the`color{Violet}" pedigree analysis"`.
● In the pedigree analysis the inheritance of a particular trait is represented in the `color{Violet}"family tree"` over generations.
● In `color{Violet}"human genetics"`, pedigree study provides a strong tool, which is utilised to `color{Violet}"trace the inheritance"` of a specific trait, abnormality or disease.
● Some of the important `color{Violet}"standard symbols"` used in the pedigree analysis have been given in the image below:
● Each and every `color{Violet}"feature"` in any organism is controlled by one or the other `color{Violet}"gene located on the DNA"` present in the chromosome.
● DNA is the `color{Violet}"carrier of genetic information"`. It is hence transmitted from one generation to the other without any `color{Violet}"change or alteration"`.
● However, changes or alteration do take place `color{Violet}"occasionally"`.
● Such an alteration or `color{Violet}"change in the genetic material"` is referred to as `color{Violet}"mutation"`.
● A number of `color{Violet}"disorders"` in human beings have been found to be associated with the `color{Violet}"inheritance"` of changed or `color{Violet}"altered"` `color{Violet}"genes or chromosomes"`.