Parallel Evolution vs Common Descent: An analogy

Photo: Scene from Dawn of the Planet of the Apes, by 20th Centruy Fox 
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The Ahmadiyya Muslim understanding of evolution is that it is intelligently guided and not random, and that different species, though sharing many features with each other, did not necessarily have a common ancestor. Man has always been human right from the very first cell he is descended from. The following is based on an interesting analogy shared by Rizwan Khan, a spokesperson for the Ahmadiyya Muslim community in the United States. He can be followed here: @Rizwan1770

Here is an analogy that may make our position on evolution easier to understand:

From the moment the sperm meets the egg, it is written in the chromosomes that the child will be either male or female, even though that difference only becomes noticeable half way through the pregnancy. An uninformed observer may say that the fetus is neutral for half of the pregnancy and then it randomly branches off to become a male, but we would explain that the fetus has always been male from the time of conception and that this has been written into its chromosomes; it only became observable at a certain point. Although we are both observing the same phenomenon, our understanding of how that phenomenon unfolded is very different.

Likewise, we may have been similar to other species of life at different stages of our evolution, and we may have appeared indistinguishable to the uninformed observer. Such an observer would say that we were apes and then we randomly branched off to become human beings at the point that those differences became apparent. What we argue is that we were always human. Just as with a fetus, where there is a certain point in gestation at which the effects of the male chromosome become distinctly observable, similarly, there was a certain point in our evolution where the effects of our human DNA became distinctly observable.

Also, it would be absurd if someone said that a fetus randomly branches off to become a male and then simultaneously develops all of the male organs in perfect harmony and in a short period of time out of random variance. These changes are guided by what was already written into our chromosomes. Similarly, we argue that it is absurd to say that apes randomly branched off and then went through very rapid, simultaneous advancements in perfect harmony, in a short period of time, out of random variance. These changes were guided by what was already written in our DNA.