Question

a biologist collects dna samples from two sisters. the younger sister has blond hair. the older sister has red hair. the sisters have different traits because their dna contains different- sized phosphate groups orders of nucleotides arrangement of sugars and phosphates types of sugar molecules

Explanation:

DNA is composed of nucleotides. The order of nucleotides in DNA forms genes, which determine traits. Different orders of nucleotides lead to different traits. Phosphate groups are of the same size in DNA. The arrangement of sugars and phosphates forms the backbone of DNA and is consistent. The sugar molecule in DNA is deoxyribose (a specific type).

Answer:

B. Orders of nucleotides