Area is always expressed in some unit of area. This is often some unit of length, squared - for example square meters, or square millimeters. However, there are units (such as the acre) which are not the square of a unit of length.
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Dominant genes will always be expressed however recessive genes would need to be inherited from both parents
Complete dominance
Mendel called the trait that was always expressed the dominant trait.
No, not all versions of each gene are always expressed in an organism. Gene expression can be regulated by various mechanisms, resulting in only certain versions or alleles of a gene being expressed under specific conditions or in specific cell types. This regulation ensures that the organism can respond to its environment and develop properly.
if the two alleles are the same in the same box in the punnett square then that trait is expressed. when there is a double in a punnett square then that gene is always expressed