Which abbreviation refers to difficulty passing urine due to obstruction at the base of the bladder?

Anita thinks that she has heterozygous alleles for red hair.if she is correct, which of these diagrams best illustrates anitas alleles pf red hair

As a small change in a person's dna can cause a genetic disorder

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not