Heredity is the transmission of traits from parents to offspring; which statements are true?

• A. Assumes The Normal Person Has 23 Pairs Of Chromosomes
• B. Assumes That Heredity Characteristics Are Transmitted By Chromosomes
• C. Assumes That Genes Are Composed Of DNA And Hold A Genetic Code
• D. All Of The Above

Answer: (D)

Heredity works through genetic material passed from parent to offspring, organized into chromosomes. In humans, the typical individual has 23 pairs of chromosomes, which provides the standard framework for inheritance. The reason traits are transmitted is that genes—specific regions on those chromosomes—carry the instructions that influence inherited characteristics. Genes are made of DNA and contain the genetic code that determines how traits are expressed. Taken together, these ideas fit the common model of inheritance: a normal chromosome pair count, transmission of genes through chromosomes, and genes encoded in DNA. While chromosomal variations can occur in some individuals, the general understanding supports all three statements as true.