The Punnett square is a diagram that is used to predict an outcome of a particular cross or breeding experiment.

The possible genes are GG,Gg, and gg.

There are 2 homozygous in the punnet square... GG and gg.

And theres 2 heterzygous outcomes. Which are Gg.

Because two parents contribute to the genetic information to produce a unigue offspring. Asexual reproduction generates offspring that are genetically identical to a single parent.

Adaptation: The action or process of adapting or being adapted.

Evolution: The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.

Species: A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.

Gene: A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

Genetic: Of or relating to genes or heredity.  

Sexual reproduction: The production of new living organisms by combining genetic information from two individuals of different types.

Asexual reproduction: Is a mode of reproduction by which offspring arise from a single organism.

If animal whee all the same then there wouldnt be any different breeds of dogs. Like some dogs wouldnt be able to hunt, some wouldnt be a certain height, and some wouldnt be able to do other things.