Genotype TT represents the genetic makeup of an organism with respect to one particular trait ( let us consider tall height of pea plant).
Homozygpous genotype is the one that contains same variants ( allele) of a gene whereas heterozygous genotype contains two different alleles ( such as Tt).
In this question, genotype TT contains two T alleles ( which are dominant as represented with capital letter). This genotype which will exhibit dominant trait such as tall height of pea plant.
Homozygotous refers to the fact that both genes for a certain characteristics are identical. Heterozygotous refers to the fact that the two genes are slightly different. TT means that both genes are the same, so it's homozygotous!
Paratism is the practice of living as a parasite in or on another organism. Mutualism is the way two organisms of different species exist in which each individual benefits from the activity of the other.
