Can some please explain recessive features, dominant traits and How is it possible for an offspring to exhibit a recessive trait if neither parent exhibited that recessive trait? What must be true about the parents’ genes for this to occur?

Question

aaronq · Answer

they must both be heterozygotes meaning they have a copy of each, the dominant allele and the recessive.

A= dominant 
a= recessive

AA = dominant homozygous genotype
aa = recessive homozygous genotype 
Aa= heterozygous genotype

so if both are heterozygous, there is a 1 in 4 chance that their offspring will have a recessive homozygous genotype.
   
You can check this by using a "punnett square":

        A       a
A     AA     Aa
a     Aa      aa

anonymous · Answer

Thank you very much. :) One more thing, can you pleas give me a definition of a recessive and a dominant traits?

aaronq · Answer

No problem !  sure, essentially dominant traits are those that "mask" or "overpower" the recessive traits .. theres a bunch of mechanisms by which this could happen.. recessive are those only seen when the organism is homozygous recessive. If you want more complete explanations use google or youtube, and you can always ask me a specific question when it gets more complicated.

anonymous · Answer

Your so wonderful ! Thank you very much :)

anonymous · Answer

I understand it a lot better now:)

aaronq · Answer

haha thanks :P

good! honestly, theres some awesome videos on youtube, look up crash course

anonymous · Answer

Okay, will do!

aaronq · Answer

(Y) woo   tell em i sent you!   jk