Hassan and Hussain are identical twins, but Hassan grows taller and fatter than Hussain. This is probably because
- A. Hassain inherits genes for tallness and fatness from the father
- B. They have dissimilar genotypes
- C. Hussain is endowed with genes for shortness and thinness
- D. They are raised in different environments
Correct Answer: Option B
Explanation
Even though Hassan and Hussain are identical twins and have the same DNA, many things can cause their height and weight to be different. Some of these things are:
1. Environmental factors: How people eat, exercise, and live can affect their growth and development. Hassan’s increased height and weight could be because he eats more calories or has a different diet than Hussain. In the same way, different levels of physical activity can also play a role.
2. Epigenetics: Epigenetics is the study of changes in gene expression that are not caused by changes in the DNA sequence but by chemical changes or other things that change how cells read and use genes. These epigenetic changes can be caused by things like diet and stress in the environment, which could make Hassan and Hussain grow and develop differently.
3. Hormonal differences: Even though identical twins have the same DNA, their bodies may make different amounts of hormones like growth hormone, thyroid hormone, or sex hormones. These hormones can affect how they grow and develop.
4. Illness or injury: If one of the twins got sick or hurt, especially during times when growth is most important, it could affect how tall or heavy they get.
5. Random variation: Small differences between identical twins can sometimes be explained by random chance since genes don’t control everything about how people grow and change.
The Bottom Line
In conclusion, It’s important to remember that these things can affect each other and that Hassan and Hussain may be of different heights and weights because of a mix of these things.