Question

Explain multiple allelism in human with the help of suitable example

Answer 1

MORE THEN TWO FORMS OF A GENE ARE CALLED MULTIPLE ALLELES.
IT IS FORMED DUE TO MUTATIONS.
THEY ARE PRESENT ON HOMOLOGOUS PAIR OF CHROMOSOMES.

EXAMPLES.
1.ABO SYSTEM OF BLOOD GROUP

2.COAT (SKIN) COLOUR OF RABBIT

3.EYE COLOUR OF DROSOPHILA.

Answer 2

Polygenic inheritance: It is the inheritance of a characteristic that is controlled by more than one gene. Polygenic inheritance can produce unexpected phenotypes.Phenotypes that don't fit with Mendel's expected outcomes based on independent assoectment of dominant and recessive alleles.

Two examples of Polygenic inheritance are:

1 Skin colour in humans

2. Height in humans

 

Multiple allelism: In this more than one alleles governs the same character and phenotype.

Example: Human blood group (ABO system) controlled by three alleles (IA, IB and i)