How dose the nucleotides and hydrogen bonds affect the structure of dna

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?

Complete the possible outcomes for each generation in the pedigree chartaa aa aa

Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin