A <u>Gametophyte</u> is a multicellular haploid form and a <u>sporophyte</u>is a multicellular diploid form in a plant that undergoes an alternation of generations.
Plants have alternative lifecycles: Haploid and diploid and this type of alternative life cycle is known as known as haplodiplontic where as our life cycle is diplontic. Gametophyte is a multicellular haploid form and a sporophyte is a multicellular dipoid form.
For him they were just discrete physical units of inheritance. Johanson coined the term "gene" and people started calling them genes. Today for us these factors are parts of DNA, the base sequences that carry the biological information to determine a trait. Mendel factors are alleles of genes.
