As identical twins get older, their observable characteristics become increasingly dissimilar, whereas their genetic makeup remains the same. In other words, their _____ changes, whereas their _____ does not.
A)dominant gene; recessive gene
B)recessive gene; dominant gene
C)genotype; phenotype
D)phenotype; genotype

Question

Quizplus · Accepted Answer

The observable physical characteristics of a person are known as phenotype whereas the genetic makeup is known as genotype. As identical twins get older, the environment they are exposed to can cause changes in their phenotype, leading to differences even though their genotype remains the same. Therefore, option D is the best choice.

As Identical Twins Get Older, Their Observable Characteristics Become Increasingly