What happens to Monozygotic twins as they age regarding physical traits?

• A. They become more genetically identical
• B. Some physical differences may appear over time
• C. They will always look the same
• D. They maintain a unique genetic profile

Answer: (B)

As monozygotic twins age, they often begin to exhibit some physical differences despite having the same genetic makeup. This phenomenon occurs due to a variety of factors such as environmental influences, lifestyle choices, and individual health experiences. While monozygotic twins share the same genes, their expressions can be affected by non-genetic factors, leading to variations in traits like body shape, skin conditions, and hair color as they grow older. This biological reality illustrates the complex interplay between genetics and environment, reinforcing the idea that experiences and lifestyle choices can impact physical characteristics over time.