Q. 254.3( 3 Votes )

Certain phe

Answer :

• Such type of inheritance in which more than two genes contribute for the phenotypic traits of an individual is known as Polygenic Inheritance.


• For example, let’s assume that the skin colour in humans is controlled by three genes, namely A, B and C.


• The dominant genes A, B and C are responsible for imparting dark colour to the skin.


• The recessive genes a, b and c are responsible for light skin colour.


• The genotype with all dominant alleles AABBCC will be darkest skin colour.


• The genotype with all recessive alleles aabbcc will be lightest skin colour.


• Whereas there is another genotype AaBbCc which imparts an intermediate skin colour. This because of the presence of three dominant alleles and three recessive alleles.


OR


• The fragments of the DNA were sequenced using automated DNA sequencers.


• Thus obtained sequences were arranged based on some overlapping sequences present in them.


This alignment of sequences couldn’t be done by humans.


• As a result of this, computer based programs were developed for the purpose of aligning.


• These sequences were annotated and were assigned to each chromosome.


• Thus, the sequence of Chromosome 1 was completed.


Caenorhabditis elegans was a free living non-pathogenic nematode who’s DNA has been sequenced.


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