The conclusion which can be drawn about the genetic makeup of the main subject is that it is a homozygous trait.
What is a Homozygous trait?
This is a term in genetics which refers to an individual having the same or similar allele for a particular gene and the features are usually expressed in the organism and examples include mm,TT etc.
On the other hand, heterozygous trait means there is are different allele for a gene and examples include Tt, Mm etc.
From the example given, we can infer that the genetic makeup of all the main subject is homozygous which is therefore the reason why it was chosen as the most appropriate choice.
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