Which scientist termed Mendelian factors as genes?

Which of the following is the unit of inheritance?

The $1/4 : 1/2 : 1/4$ ratio of $TT : Tt : tt$ can be depicted mathematically by the binomial expression (ideally):

Define/Explain: Genotype.

Who proposed the term 'Allelomorph'?

$A$ human male is heterozygous for autosomal genes '$A$' and '$B$'. He is also hemizygous for the haemophilic gene '$h$'. What percentage of sperms will carry the '$abh$' genotype (in $\%$) (in $\%$)?