F2 generation in a Mendelian cross showed that genotypic ratio is 1: 2: 1. It represents a case of
A
Co-dominance
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Dihybrid cross
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Monohybrid cross with complete dominance
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Incomplete dominance
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is D Monohybrid cross with complete dominance Monohybrid cross means considering a single trait for the cross over. For example, considering the length of a plant and the alleles are
Parents TT X tt
Gametes T T t t
F1 Tt Tt Tt Tt
Tt x Tt
F2 TT Tt Tt tt
so the offsprings are three tall but genotypically one homozygous tall and two heterozygous tall that represents complete dominance and one dwarf plant.
Hence the genotypic ratio of 1:2:1 represents the monohybrid complete dominance.
So, the correct answer is 'Monohybrid cross with complete dominance'