Describe pedigree analysis and draw its symbols.
 

Vedclass pdf generator app on play store
Vedclass iOS app on app store

The idea that disorders are inherited has been prevailing in the human society since long.

This was based on the heritability of certain characteristic features in families.

After the rediscovery of Mendel's work the practice of analysing inheritance pattern of traits in human beings began.

Since it is evident that control crosses that can be performed in pea plant or some other organisms are not possible in case of human being study of the family history about inheritance of a, particular trait provides an alternative.

Such an analysis of traits in a several of generation of family is called pedigree analysis.

In the pedigree analysis the inheritance of a particular trait is represented in the family tree over generations.

In human genetics, pedigree study provides a strong tool, which is utilised to trace the inheritance of specific trait, abnormality or disease.

Some of the important standard symbols used in the pedigree analysis have been shown in figure.

Inheritance pattern of traits in human beings cannot be studied by crosses as in case of other organisms due to following reasons : $(i)$ The progeny produced in very small (usually one) and therefore, take long time. $(ii)$ Controlled crosses cannot be performed.

967-s47

Similar Questions

Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The gene $'a'$ and $'b'$ could be of

Person whose father is colourblind marries a lady whose mother is daughter of a colourblind man. Their children will be

Female rarely experience the physiologic defect of haemophilia because they do so only when they are

A colourblind man has a colourblind sister but a normal brother than phenotype of its parents is

Given below is pedigree chart showing the inheritance of a certain trait in human. Select the correct option for the given chart