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Name: maryan
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Question:
what causes recessive genes to not be expressed? what causes the different kinds of expression to occur? how are genes inherited through different types of dominences (ineritance) patterns? what determines how genes are inherited (through what patterns).



Replies:
Genes code for proteins. You inherit two copies of each gene-one from your mother and one from your father. Some genes code for proteins that are structural (ie. collagen), some that are informational (ie. a hormone), and some that are enzymes. If you inherit a dominant form of the gene you usually inherit the instructions for making the product. For some genes, you only need one copy to make enough of the protein to get the job done. In others, one copy of the gene gives you half the amount you need but that's enough to keep you healthy. If you inherit the recessive copy, sometimes you don't make the protein at all. Sometimes it causes you to make a defective protein that doesn't work as well or not at all. Many times that causes problems.

Van Hoeck



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