2 Suggested edit of a mistake in the comments
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Evolution is a long process, but each step is based on a tiny mutation.

The mutation stayspreads in the genetic pool if it's a positive change for the specie, and a positive change can be :

  • Life improved (finding or assimilating food/water, resist to heat/cold...)
  • Death avoided or life last longer (protecting from predators by poison, hiding, defense strategies, resisting diseases...)
  • Reproduction improved (Better looking for the partner, more childs...)

(If i forget something, please add in the comments)

To prevent evolution, you could stop mutation.

Sexual reproduction provoque mutation. Make all your creatures some clones and you will slow evolution down (even if it might not be stopped, even with parthenogenesis small mutation occurs)

Interspecies DNA exchanges cause mutation (bacteria and viruses in your body are currently playing with some of your cells DNA, yuck). Very hard to stop, but it is a God's work. Here is a totally imaginary biology. Make viruses and tiny life forms very stable, or their DNA code very different from the "big" creatures, or make each cell inpenetrable to other forms of life.

If you don't want to change the whole world biology, try to make evolution unuseful

Have a very stable environment. You don't want species to evolve, even a little bit, because the summer was very hot and dry and this year's young frogs resist a higher temperature.

Make your creatures' life a paradise. Evolution usually makes life longer and more secure. Without predators, less selection. Without diseases, less selection. With every creature equally healthy and beautiful, no partner selection (again with the clones). The more humans make their life confortable, the less they evolve. They are no more selected by predators, diseases or disabilities. "Bad" genes do not disapear, "Good" ones do not offer a significant advantage on the number of childs to change the whole specie.

Make each kind of creatures very numerous. A tiny mutation is more likely to drown in the genetic pool of a very large group of creatures.

Bonus : now you have to find a way to keep a fair amount of creatures on your planet. Either they all die from age, or they live very long and have few children, for example ?

Conclusion your god have a lot of work to do during the creation if he wants to relax later. Evolution is a lazy but effective solution. But if you really have a god's power, you could just create a kind of creatures that eat or kill everything that doesn't fit the plan. Like a robot with a database of all living creatures. If this chicken does have more than 1% difference with the registred DNA code "chicken", kill it.

Evolution is a long process, but each step is based on a tiny mutation.

The mutation stay in the genetic pool if it's a positive change for the specie, and a positive change can be :

  • Life improved (finding or assimilating food/water, resist to heat/cold...)
  • Death avoided or life last longer (protecting from predators by poison, hiding, defense strategies, resisting diseases...)
  • Reproduction improved (Better looking for the partner, more childs...)

(If i forget something, please add in the comments)

To prevent evolution, you could stop mutation.

Sexual reproduction provoque mutation. Make all your creatures some clones and you will slow evolution down (even if it might not be stopped, even with parthenogenesis small mutation occurs)

Interspecies DNA exchanges cause mutation (bacteria and viruses in your body are currently playing with some of your cells DNA, yuck). Very hard to stop, but it is a God's work. Here is a totally imaginary biology. Make viruses and tiny life forms very stable, or their DNA code very different from the "big" creatures, or make each cell inpenetrable to other forms of life.

If you don't want to change the whole world biology, try to make evolution unuseful

Have a very stable environment. You don't want species to evolve, even a little bit, because the summer was very hot and dry and this year's young frogs resist a higher temperature.

Make your creatures' life a paradise. Evolution usually makes life longer and more secure. Without predators, less selection. Without diseases, less selection. With every creature equally healthy and beautiful, no partner selection (again with the clones). The more humans make their life confortable, the less they evolve. They are no more selected by predators, diseases or disabilities. "Bad" genes do not disapear, "Good" ones do not offer a significant advantage on the number of childs to change the whole specie.

Make each kind of creatures very numerous. A tiny mutation is more likely to drown in the genetic pool of a very large group of creatures.

Bonus : now you have to find a way to keep a fair amount of creatures on your planet. Either they all die from age, or they live very long and have few children, for example ?

Conclusion your god have a lot of work to do during the creation if he wants to relax later. Evolution is a lazy but effective solution. But if you really have a god's power, you could just create a kind of creatures that eat or kill everything that doesn't fit the plan. Like a robot with a database of all living creatures. If this chicken does have more than 1% difference with the registred DNA code "chicken", kill it.

Evolution is a long process, but each step is based on a tiny mutation.

The mutation spreads in the genetic pool if it's a positive change for the specie, and a positive change can be :

  • Life improved (finding or assimilating food/water, resist to heat/cold...)
  • Death avoided or life last longer (protecting from predators by poison, hiding, defense strategies, resisting diseases...)
  • Reproduction improved (Better looking for the partner, more childs...)

(If i forget something, please add in the comments)

To prevent evolution, you could stop mutation.

Sexual reproduction provoque mutation. Make all your creatures some clones and you will slow evolution down (even if it might not be stopped, even with parthenogenesis small mutation occurs)

Interspecies DNA exchanges cause mutation (bacteria and viruses in your body are currently playing with some of your cells DNA, yuck). Very hard to stop, but it is a God's work. Here is a totally imaginary biology. Make viruses and tiny life forms very stable, or their DNA code very different from the "big" creatures, or make each cell inpenetrable to other forms of life.

If you don't want to change the whole world biology, try to make evolution unuseful

Have a very stable environment. You don't want species to evolve, even a little bit, because the summer was very hot and dry and this year's young frogs resist a higher temperature.

Make your creatures' life a paradise. Evolution usually makes life longer and more secure. Without predators, less selection. Without diseases, less selection. With every creature equally healthy and beautiful, no partner selection (again with the clones). The more humans make their life confortable, the less they evolve. They are no more selected by predators, diseases or disabilities. "Bad" genes do not disapear, "Good" ones do not offer a significant advantage on the number of childs to change the whole specie.

Make each kind of creatures very numerous. A tiny mutation is more likely to drown in the genetic pool of a very large group of creatures.

Bonus : now you have to find a way to keep a fair amount of creatures on your planet. Either they all die from age, or they live very long and have few children, for example ?

Conclusion your god have a lot of work to do during the creation if he wants to relax later. Evolution is a lazy but effective solution. But if you really have a god's power, you could just create a kind of creatures that eat or kill everything that doesn't fit the plan. Like a robot with a database of all living creatures. If this chicken does have more than 1% difference with the registred DNA code "chicken", kill it.

1
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Evolution is a long process, but each step is based on a tiny mutation.

The mutation stay in the genetic pool if it's a positive change for the specie, and a positive change can be :

  • Life improved (finding or assimilating food/water, resist to heat/cold...)
  • Death avoided or life last longer (protecting from predators by poison, hiding, defense strategies, resisting diseases...)
  • Reproduction improved (Better looking for the partner, more childs...)

(If i forget something, please add in the comments)

To prevent evolution, you could stop mutation.

Sexual reproduction provoque mutation. Make all your creatures some clones and you will slow evolution down (even if it might not be stopped, even with parthenogenesis small mutation occurs)

Interspecies DNA exchanges cause mutation (bacteria and viruses in your body are currently playing with some of your cells DNA, yuck). Very hard to stop, but it is a God's work. Here is a totally imaginary biology. Make viruses and tiny life forms very stable, or their DNA code very different from the "big" creatures, or make each cell inpenetrable to other forms of life.

If you don't want to change the whole world biology, try to make evolution unuseful

Have a very stable environment. You don't want species to evolve, even a little bit, because the summer was very hot and dry and this year's young frogs resist a higher temperature.

Make your creatures' life a paradise. Evolution usually makes life longer and more secure. Without predators, less selection. Without diseases, less selection. With every creature equally healthy and beautiful, no partner selection (again with the clones). The more humans make their life confortable, the less they evolve. They are no more selected by predators, diseases or disabilities. "Bad" genes do not disapear, "Good" ones do not offer a significant advantage on the number of childs to change the whole specie.

Make each kind of creatures very numerous. A tiny mutation is more likely to drown in the genetic pool of a very large group of creatures.

Bonus : now you have to find a way to keep a fair amount of creatures on your planet. Either they all die from age, or they live very long and have few children, for example ?

Conclusion your god have a lot of work to do during the creation if he wants to relax later. Evolution is a lazy but effective solution. But if you really have a god's power, you could just create a kind of creatures that eat or kill everything that doesn't fit the plan. Like a robot with a database of all living creatures. If this chicken does have more than 1% difference with the registred DNA code "chicken", kill it.