When a Tall plant (TT) is crossed with tt (Short plant) all the offspring will be tall because T is dominant over small t. This happen in the first filail generation.
TT×tt
Tt Tt Tt Tt- all tall pea plant.
Complete dominant occurs when a dominant allele expresses itself over a recessive allele such that the phenotype expressed is of the dominant traits.
The important role of the atmosphere is to supply oxygen, water, carbon dioxide and nutrients. It also protects all living things from extreme temperatures and radiation (protects us from harmful solar rays).
