A I believe, hope it helps.
Answer:
<u>HYDROGEN BONDS</u>
Explanation:
A DNA molecule consists of two strands of nucleotides twisted together to form a double helix. The sugar-phosphate backbone is found on the outside of this helix and the bases are found braching towards the middle. Hydrogen bonds join the the nitrogenous bases and hold the two strands together.
<span>The ability to taste PTC is due to the presence of at least one dominant allele for the PTC taste gene, so a nontaster genotype should be homozygous recessive(pp). If the frequency of pp is 45%, then frequency of p would be:
pp=0.45
p= </span>√0.45
p=67%
p+P= 100%
P= 100%- p
P= 100%-67%= 33%
<span>The number of North American population that has is homozygous dominant(PP) genotype would be:
P=33%
PP= 33%^2= 10.89% = 0.1089 = 0.11</span>
