Alleles are:
1. different phenotype
2. true breeding homozygotes
3. different molecular forms of a gene
4. heterozygotes
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1: 2: 1. It represents a case of:
1. Co-dominance
2. Dihybrid crosses
3. Monohybrid crosses with complete dominance
4. Monohybrid crosses with incomplete dominance