Is it possible for two people to have the same karyotype and/or phenotype?

Question

The probability is extremely large, but is it still possible? What about the case with identical twins?

Answer 1

Karyotypes are pictures of the chromosomes. We should all have the same karyotype unless we have a chromosomal abnormality of some sort.

Can we have the same phenotype? Individual phenotypes like brown eyes or left-handed, yes. Every last phenotype identical? Even identical twins have some differences in phenotypes because the environment plays a role.

Answer 2

Only if they are identical twins or true human clones.