conrruption wrote:My understanding is that for a recessive trait to show both parents must be homozygous recessive. What I don't understand is, if both parents pass on w, won't their children be ww? The environment does play a part and genes are passed down but how can a dominant gene show up when ww was passed? 
This is incorrect. A homozygous recessive (ww) does not need to have both parents as homozygous recessive. The mother can be heterozygous (Ww) and the father can be heterozygous (Ww) giving a 25% chance of producing progeny of homozygous recessive (ww) & 50% chance of producing heterozygous (Ww).
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