A genetic marker is __________.

• A. a place where a restriction enzyme cuts DNA
• B. a chart that traces the family history of a genetic trait
• C. a radioactive probe used to find a gene
• D. an enzyme used to cut DNA
• E. a particular nucleotide sequence at a particular locus whose inheritance can be followed

Answer: (E)

Verified step by step guidance

1. Begin by understanding the concept of a genetic marker. A genetic marker is a specific sequence of DNA at a particular location (locus) on a chromosome that can be used to track inheritance patterns in families or populations.
2. Consider the options provided in the problem. Each option describes a different aspect of genetics or molecular biology.
3. Option 1: 'a place where a restriction enzyme cuts DNA' refers to a restriction site, which is a specific sequence where enzymes cut DNA, not a genetic marker.
4. Option 2: 'a chart that traces the family history of a genetic trait' describes a pedigree, which is used to track inheritance but is not a genetic marker itself.
5. Option 3: 'a radioactive probe used to find a gene' refers to a technique used in molecular biology to locate specific DNA sequences, but it is not a genetic marker. Option 4: 'an enzyme used to cut DNA' describes a restriction enzyme, which is used in genetic engineering but is not a genetic marker. The correct answer is a particular nucleotide sequence at a particular locus whose inheritance can be followed.