Multiple Choice
In the context of DNA as the genetic material, what is the primary function of DNA in a cell?
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7. DNA and Chromosome Structure
DNA as the Genetic Material
Multiple Choice
In humans, each person’s DNA sequence is unique except for which of the following?
A
Parent and child
B
Dizygotic (fraternal) twins
C
Monozygotic (identical) twins
D
Full siblings (non-twins)
Verified step by step guidance1
Understand that human DNA sequences are unique to each individual, but there are exceptions where individuals share identical or nearly identical DNA.
Consider the genetic relationship between parent and child: a child inherits half of their DNA from each parent, so they share about 50% of their DNA, but their sequences are not identical.
Look at dizygotic (fraternal) twins: they develop from two different eggs fertilized by two different sperm, so they share about 50% of their DNA, similar to regular siblings, but their DNA sequences are not identical.
Examine full siblings (non-twins): like dizygotic twins, they share about 50% of their DNA on average, but their sequences are not identical.
Focus on monozygotic (identical) twins: they originate from a single fertilized egg that splits into two embryos, resulting in two individuals with nearly identical DNA sequences.
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