$A$ factor (allele) is dominant if it is expressed in ...............

In $1900$ $A.D.$,three biologists independently discovered Mendel's principles. They are:

Gregor Mendel was a native of which country?

If a normal enzyme is produced by a modified allele,what will be the effect on the phenotype?

Mendel published his work on the inheritance of characters in $1865$,but it remained unrecognized until $1900$ because:
$(a)$ He could not provide any physical proof for the existence of factors.
$(b)$ His concept of factors as stable,discrete units that controlled the expression of traits did not find acceptance from his contemporaries.
$(c)$ Mendel's approach of using mathematics to explain biological phenomena was considered ahead of its time and unconventional.
$(d)$ Communication was not easy (as it is now),and his work could not be widely publicized.

Two alternative forms of a gene or alleles are located on . . . . . . .