Different varieties of the same gene are called

✏️Genotypes:
-The genotype of an organism is the complete set of genetic material. 

✏️Sib pairs:
-Sib pair linkage analysis of a dichotomous trait is a popular method for narrowing the search for genes that influence complex diseases.

✏️Isomers:
-Isomers are compounds that contains the same number of atoms, i.e., they have exactly the same empirical formula, but they differ from each other by the way in which the atoms are arranged.
🛑Important Points: 
-Alleles are different versions of genes and are either dominant or recessive, depending upon what traits they are associated with.
-If an allele is dominant, then it will express traits even in the presence of one copy of an allele.
-If an allele is recessive, then it will express traits only when two copies of an allele are present.