phenylketonuria is an inherited disease caused by a recessive allele. if a woman and her husband are both carriers, what is the probability that their first child will be a girl without phenylketonuria?

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

what are the options? add them, then i will be glad to .