Question

How can you prove that a gene is dominant or recessive? Explain with examples.

Answer 1

The dominant gene always writes in capital letter and recessive gene always writes in small letters

EX. TT(tallness trait)

      tt(dwarfness trait)

Answer 2

To prove Gene is Dominant or Recessive:

Consider the alleles coding for traits shape of the pod in pea plant, in which RR (Round) is considered as one parent and rr (wrinkled) is considered as another parent.

When it is crossed it leads to the F1 generation as Rr and Rr, which means that all the offspring of this stage are Round but no wrinkled offspring are there.  

This proves that the round is considered as dominant parent whereas the wrinkled is considered as recessive parent.