Multiple Choice
In classical Mendelian genetics, which of the following represents a genotype?
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
In humans, each person’s DNA profile is unique except for which of the following pairs?
A
A parent and their biological child
B
Identical (monozygotic) twins
C
Fraternal (dizygotic) twins
D
Two unrelated individuals from the same population
Verified step by step guidance1
Understand that a DNA profile represents the unique genetic makeup of an individual, which is mostly distinct except in certain cases.
Recall that identical (monozygotic) twins originate from a single fertilized egg that splits, resulting in two individuals with nearly identical DNA profiles.
Recognize that a parent and their biological child share about 50% of their DNA, so their profiles are similar but not identical.
Know that fraternal (dizygotic) twins come from two different eggs fertilized by two different sperm, so their DNA profiles are as different as typical siblings.
Conclude that the only pair with truly identical DNA profiles are identical (monozygotic) twins, making them the correct answer.
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