A cross between two pea plants tall with axial flowers and dwarf with terminal flowers produced offsprings tall with axial flowers and tall with terminal flowers in the ratio 1 : 1. what will be the genotype of parents
Answers
The cross explained is a dihybrid cross which exhibits simultaneous inheritance of two characters. This is also called as dihybrid inheritance.
Dihybrid inheritance is the experimentation of two characteristics with their four contrasting traits.
For instance, dihybrid inheritance involves a pea plant producing axial and violet flowers (AA and WW) crossing with a plant producing terminal and white flowers (aa and ww).
F1 progeny produces axial and violet flowers (A and a, W and w ) in which axial and violet are dominant traits.
F2 progeny were similar to their parents and produced axial and violet flowers, while some of them produced terminal and white flowers. However, some plants of the F2 progeny even showed new combinations, like axial white flowers and terminal violet flowers.
*Dominant traits - Axial, Violet
*Recessive traits - Terminal, White
*Phenotype of the offspring - 9 Axial violet : 3 Terminal violet : 3 Axial white : 1 Terminal white
*Genotype of the offspring - 9 AAWW : 3 aaWW : 3 AAww : 1 aaww