What is the question ??
The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior. An organism's phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes.
3) a
due to how the nucleus makes up cell chromosomes as to multiplying and etc
We rely on Meiosis so that we can produce/have genetic diversity. It also enables us to have proper conditions for reproductive success.
Failure to comply
Costs out weighing the benefits