Preformation theory concerning transmission of characters was given by
Swamerdom
Aristotle
Wolf
Pythagorous
When Mendel self hybridised the $F_{1}$ plants $(RrYy)$, he found that dominant and recessive traits of one character are segregated in a
Mendel enunciated
Improvement of human race through hereditary qualities is called
Mendel published his work on inheritance of characters in $1865$ but it remained unrecognised till $1900$ 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 the contemporaries
$(c)$ Mendel's approach of using mathematics to explain biological phenomena was totally old
$(d)$ Communication was not easy (as it is now)
Sex-linked characters are