The technology for it exists, but even if you managed to extract someone’s DNA injecting it onto a new set of stem cells: once the baby is born, the only thing that genetic code is inheriting is the appearance. They would resemble that person by looks only, however what remains a total mystery is: whether he or she’ll have the same personality or behavior as that individual. (You won’t know until they gotten older).
For example: this dog passed away, then extracting the genes from that carcass now injecting that onto a pregnant dog of the same breed who’ll soon give birth to a familiar looking pup but despite it looking similar to the one you knew: why won’t it inherit the same behavior or mannerisms as the source gene? Will that dog recognize the dead dog’s owner or would it behave like it’s someone else’s animal?
Genetic duplication sounds “fun” at first but, it comes at a cost:
- Slated memory (this person looks like someone you knew but they have zero recollection of their life)
- Varying behavior and traits (they look like someone you knew, although they display different personalities)
- The consensus is that the first gene holder is dead, a clone won’t be considered the same as “original”
- The family of the deceased considers them dead even if you have a genetic clone of their relative
Personality is certainly influenced by genes: there have been cases of identical twins separated at birth allowing similarities between the twins to be studied https://science.howstuffworks.com/life/genetic/5-true-stories-twins-separated-at-birth.htm
The idea that memories of lived experience can be inherited was historically popular, but has been very much disproven unless you count quite tenuous examples https://en.wikipedia.org/wiki/Genetic_memory_(psychology)
The personality bit also makes a sort of sense if you think about it. Whether you frame it as “nature or/and nurture” or “genetics and epigenetics”, it takes both sides to make a person.
The genetic component is sorta like the blueprint to make a person’s hardware, and everyone is made up of very hyper specialized micromachines. Then life experience gives you the software that runs them.
So twins would share the same sort of specific hardware that makes it more likely to optimize for running certain software.