Scioly.org

Does anyone know if there's supposed to be anything on SRY genes for the Division B test? I found quite a few questions on a test that cover a bit of in-depth material on the subject... and I'm fairly certain that the test wasn't aligned to the rules properly.

CulturallyScientific wrote:Does anyone know if there's supposed to be anything on SRY genes for the Division B test? I found quite a few questions on a test that cover a bit of in-depth material on the subject... and I'm fairly certain that the test wasn't aligned to the rules properly.

At states for Div. C, there was only one multiple choice question on that. I would think that according to the rules manual, you wouldn't need to know that for Heredity, but why not look it over if you've got time?

Haha, who am I kidding... Scioly-ers never have time. Anyways, I wouldn't focus very much on SRY genes.

Okay, thanks!

Does Division B need to know about the operons?

If so, can someone explain to me the principle of the Lac and Trp Operons?

I don't have the rules manual for B, so not entirely sure. That said, it is definitely good to know.

The 3 proteins/enzymes needed metabolizing for lactose are all located on the same section of DNA called the Lac Operon. The genes only “turn on” when there is lactose to be metabolized. (The presence of lactose will activate the genes to start protein synthesis) This is an example of an inducible operon, where the presence of a substance triggers production.

The 5 enzymes for tryptophan synthesis are all clustered on the same chromosome in what is called the Trp Operon. If you add tryptophan to a culture of bacteria, they stop producing the enzymes needed to synthesize Trp. This is a repressable operon, where the presence shuts production off.

These two operons are generally found on prokaryotes.

Ah just one more thing, I've noticed that on the wiki, when you click on the link for Heredity, it redirects you to the page for Designer Genes. Is there any difference between the two, or is one just harder than the other?

Epicness101 wrote:Ah just one more thing, I've noticed that on the wiki, when you click on the link for Heredity, it redirects you to the page for Designer Genes. Is there any difference between the two, or is one just harder than the other?

That's a bit strange, but I'd assume that it does that because Designer Genes includes all the topics for Heredity plus some other topics like molecular genetics. So If you're doing Heredity, you don't have to learn everything on the Designer Genes page!

Designer Genes and Heredity are essentially the same, just that DG is for Div. C and includes more topics, while Heredity is for Div. B and doesn't include topics like Hardy Weinberg equations, etc.

Speaking of equations, is there any math required for heredity?

No. Hardy-Weinberg is really the only genetics topic that requires math, and it is not tested in Heredity. Of course, basic math is required to do mono-, di-, and trihybrid crosses, but you knew that already.