Phenylalanine is an amino acid found in all protein rich foods and even some artificial sweeteners. Phenylalanine build up in the blood affects nerve and brain developement. The condition phenylketonuria, or PKU, is caused by the toxic buildup of the amino acid phenylaline. the effects of PKU can be reduced by removing foods containing phenylalanine from the diet.

Question

which statement is true about expressed traits of PKU and enviromental factors?

PKU leads to blood circulation problems because environmental factors cause phenylalanine to build up in the red blood cells.
PKU leads to blood circulation problems in patients and is caused by the environmental factor of eating phenylalanine foods.
PKU leads to nerve and mental problems, and is caused by the environmental factor of eating food that has chenylalanine in it.
PKU leads to nerve and mental problems regardless of environmental factors.

Answer 1

The statement that is true about expressed traits of PKU (Phenylketonuria) and environmental factors is:

PKU leads to nerve and mental problems, and is caused by the environmental factor of eating food that has phenylalanine in it.

This is accurate because PKU is a genetic disorder that results in the body's inability to break down phenylalanine, leading to its accumulation. The presence of phenylalanine in the diet, especially from protein-rich foods, directly contributes to the development of the disorder's symptoms, which include neurological issues. By avoiding phenylalanine in the diet, individuals with PKU can mitigate these effects.