What are the 4 nitrogenous bases of dna

How many copies of each chromosomes should be present in each of the 4 final haploid versions of gamete?

Ayoung boy has been found and police are trying to locate his family they take a dna sample from him and begin collec dna samples from families who have missing children if police use dna samples only from the fathers, which type of dn technology can they use to identify the boy's parent? y-chromosome analysis omtdna (mitochondrial dna) analysis vntrs (variable tandem repeats) o pcr (polymerase chain reaction) analysis

What must be done to breed dogs for a partical trait