Question

A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because: 

A. tallness is the dominant trait 

B. shortness is the dominant trait 

C. tallness is the recessive trait 

D. height of pea plant is not governed by gene ‘T’ or ‘t’

Answer 1

In heterozygous conditions such those of first progeny, only the dominant trait expresses itself in the phenotype. Thus, tallness is a dominant trait.