Question

scientific studies show that identical twins who were separated at birth and raised in different homes may vary in height, weight, and intelligence. the most probable explanation for these differences is that
(1 point)
original genes of each twin increased in number as they developed
one twin received genes only from the mother while the other twin received genes only from the father
environments in which they were raised were different enough to affect the expression of their genes

Explanation:

1. Analyze the first option: Genes do not increase in number as individuals develop in the way suggested; this is not a valid biological concept. So this option is incorrect.
2. Analyze the second option: Identical twins come from the same fertilized egg (or zygote) that splits, so they have the same genetic material from both parents. This option is biologically incorrect.
3. Analyze the third option: Identical twins have the same genes, but different environments (like different diets, lifestyles, exposures shown in the icons: fast food, alcohol, smoking, etc.) can affect how genes are expressed (epigenetics), leading to differences in traits like height, weight, and intelligence. This matches the scenario of twins raised in different homes.

Answer:

C. environments in which they were raised were different enough to affect the expression of their genes