There are two main reasons. First, there are introns and exons existed in eukaryotes. Introns do not contain the genetic information but are in large amount in chromosome. So, if the mutation occurs in the introns, it will be recessive. Second, one amino acid will corresponding to several base sequences. For example, UUU and UUC all represent Phe. This is called degeneracy. So if the mutation did not change the amino acid, it is also recessive.
Answer:
DNA
Explanation:
DNA
Avery is best known for his 1944 discovery that DNA is the material of which genes and chromosomes are made.
They would have had to have received the gene from both their mother and father. This gene is carried on the X chromosome and is only shown in females when it is present on both.
