Phenylketonuria is an inherited disease caused by a recessive autosomal allele. if a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl? phenylketonuria is an inherited disease caused by a recessive autosomal allele. if a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl?

a. 3/8
b. 1/4
c. 1/16
d. 3/16

The ans will be

Explanation:

As phenylketonuria is a recessive autosomal disease, and both the parents are carrier, so they both carry one defective gene and one good gene.

If they produced 4 children, the probability of diseased and non diseased child will be as follows.

diseased:

non diseased:  

And the probability of male and female child will be .

So, the probability of phenotypically normal first girl child will be × ⇒

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex