Question

In Mendelian monohydrid cross, which generation is always heterozygous?

• A. First filial generation
• B. Second filial generation
• C. Third Filial generation
• D. Parent generation

Answer 1

The correct option is A First filial generation

In Mendelian monohybrid cross, only one trait or character is considered for the study. In a monohybrid cross, first filial generation or F${}_1$ generation is always heterozygous and it shows dominant phenotype. For example, when a cross is made between homozygous tall (TT) plant and homozygous dwarf (tt) plant, first filial generation will have genotype Tt (heterozygous) and all plants will be tall.

Thus, the correct answer is option A.