Question

Which statement best describes a dominant allele?

A. The version of the trait that is more beneficial to the individual's survival
B. The version of the trait that is expressed over other alleles for the same trait
C. The version of the trait that is expressed only if the individual is heterozygous for that trait
D. The version of the trait that is expressed only if the individual is homozygous for that trait

Answer 1

Dominant allel is only expressed when their is recessive allel, so their is only one condition in which it is possible that is in heterozygous

Answer 2

"B) The version of the trait that is expressed over other alleles for the same trait." is the best statement that describes a dominant allele.    

Explanation:

Dominant alleles have specialty to express themselves in homozygous and heterozygous state.

for example Tt and TT both codes for a tall tree.