Zodiac Signs

Today I tried an application in facebook regarding All about Zodiac Personalities and Characteristics and I got the following results:

Dear Abhishek Sainani, below are All About Zodiac Characteristics and Personality for Zodiac Sign Gemini:

Gemini Characteristics and Profile
Gemini go everywhere together, hand-in-hand, symbolizing your dual nature. Our world comes in pairs: good and evil, male and female, in and out, yin and yang -- and you Geminis are living proof. Some might say Gemini are an entanglement of paradoxes, but the truth is that Gemini have an easy acceptance of opposites.

Element: Air
With active minds and a good command of language, the air signs are the natural born communicators. They can be light and breezy as the breath of spring, but their words can also carry the power of a gale force wind.

Third House: Communication
The Third House symbolizes all aspects of communication -- and most communication happens within our immediate environment. Therefore this is also the house of our surrounding.

Key Planet: Mercury
As the key planet of Gemini, Mercury is restless and changeable. It drives us to talk and to listen, but not necessarily to action.

Gemini Greatest Strength:
Your curiosity about a variety of interests

Gemini Possible Weakness:
Distracting yourself from what is most important

Interestingly enough, everything written in this is true for me, or is it that I'm just thinking that its true because its about my Zodiac Sign, Gemini?!
Well, certainly there's more to me and this is about all the Geminis in general. But if a group of people sharing same zodiac sign exhibit some common traits, what about inheritance and information coded in genes? A libran mother and a scorpion father give birth to a gemini son, then would he have qualities of a libran, a scorpion because of inheritance and a gemini due to his birthdate?!
Genetics has been well studied, so no dispute on that but seriously, does the date of one's birth really affect one's personality? Or is it also the mating date of the parents that also counts?
I see astrology and related studies as science which can be worked out to give accurate results, the only problem currently being that, I think, we don't take into consideration all the parameters. Once the time comes when we learn about all the required parameters, then only birth date and birth place would be enough to predict someone's future... something that always fascinates me...