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Identical twins have the same genotype - HSC - SSCE Biology - Question 8 - 2012 - Paper 1
Question 8
Identical twins have the same genotype. Why are there small differences between the phenotypes of identical twins? (A) Some genes are not co-dominant. (B) Environ... show full transcript
Worked Solution & Example Answer:Identical twins have the same genotype - HSC - SSCE Biology - Question 8 - 2012 - Paper 1
Step 1
Why are there small differences between the phenotypes of identical twins?
Answer
Identical twins share the same genotype, meaning they have identical genetic material. However, small differences in their phenotypes can arise due to environmental factors that influence gene expression.
The correct answer to this question is (B) Environment affects the expression of genes.
Explanation:
Environmental influences can include factors such as:
- Nutrition
- Temperature
- Exposure to toxins
- Social interactions
These influences can interact with their shared genetic makeup in various ways, leading to observable differences between the twins in traits such as height, weight, and even susceptibility to certain diseases.