How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting tralts$?$

Absence or excess or abnormal arrangement of one or more chromosomes results in

Mating among close relations is referred

Continuous variations are attributed to

Barr bodies (seen in saliva test in Olympic games) are found in human and are associated with

Hugo de Vries formulated the “Mutation Theory'' based on the experiments he conducted on