What is a geneotype and a phenotype

The genotype is the set of genes in our DNA which is responsible for a particular trait. The phenotype is the physical expression, or characteristics, of that trait. For example, two organisms that have even the minutest difference in their genes are said to have different genotypes.

They are traits or characteristics  hope this helps
for example two organisms that have even the minutest difference 

No because scientist are still changing there mines today so they are not correct to this day