Question

which of the following crosses would produces a genotypic ratio of 1:2:1

Answer 1

The expected genotype ratio when two heterozygotes are crossed is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive). When a phenotypic ratio of 2 : 1is observed, there is probably a lethal allele. so, hence monohybrid cross produces a genotypic ratio of 1:2:1