Which of the following statements is consistent with the DNA profile shown below?

a. B is the child of A and C
b. C is the child of A and B
c. D is the child of B and C
d. A is the child of B and C
e. A is the child of C and D

Verified step by step guidance

1. Step 1: Understand the concept of DNA profiling. DNA profiling involves comparing DNA band patterns to determine genetic relationships. A child inherits half of their DNA from each parent, so their DNA bands will match bands from both parents.
2. Step 2: Analyze the DNA bands for individual A. Note the positions of the bands in A's profile and compare them to the profiles of B, C, and D.
3. Step 3: Compare the DNA bands of B and C to A. Check if A's bands can be explained as a combination of bands from B and C, which would indicate that A is their child.
4. Step 4: Analyze the DNA bands for individual D. Compare D's bands to B and C to determine if D's bands are a combination of bands from B and C, which would indicate that D is their child.
5. Step 5: Evaluate all options (a, b, c, d, e) based on the comparisons made. Determine which statement is consistent with the DNA profiles shown, ensuring the child’s bands match a combination of the parents’ bands.

Key Concepts

DNA Profiling

DNA profiling, also known as DNA fingerprinting, is a technique used to identify individuals based on their unique DNA characteristics. It involves analyzing specific regions of DNA that vary greatly among individuals, allowing for comparison between samples. This method is commonly used in forensic science, paternity testing, and genetic research.

Gel Electrophoresis

Gel electrophoresis is a laboratory method used to separate DNA fragments based on their size. In this technique, DNA samples are placed in a gel matrix and subjected to an electric field, causing the fragments to migrate at different rates. Smaller fragments move faster than larger ones, resulting in a distinct banding pattern that can be visualized and compared across samples.

Inheritance Patterns

Inheritance patterns refer to the ways in which genetic traits are passed from parents to offspring. Understanding these patterns is crucial for interpreting DNA profiles, as they can indicate familial relationships. For example, a child inherits half of their DNA from each parent, which can be analyzed to determine potential parent-child relationships based on matching DNA bands in a gel electrophoresis result.