Final Answer:
Yes, there is a heritable variation of having a nose. Thus the correct option is a.
Step-by-step explanation:
The heritability of traits, including nose shape, is well-established in genetics. Heritability refers to the proportion of observed variation in a trait within a population that can be attributed to genetic factors. Nose shape, like many other physical features, is influenced by a combination of genetic and environmental factors. Studies involving twins and family pedigrees have provided evidence for the heritability of nose shape, suggesting that genetics play a significant role in determining the variation observed in nose characteristics among individuals.
Research in human genetics has identified specific genes associated with facial features, including those influencing nose shape. Variations in these genes contribute to the diversity of nose shapes observed within populations. While genetics play a crucial role, it's important to note that environmental factors, such as nutrition and developmental influences, also contribute to the final appearance of the nose. The complex interplay between genetic and environmental factors makes the study of heritability intricate, but evidence supports the notion that there is a heritable component to nose shape variation.
In conclusion, the answer to the question is affirmative – there is heritable variation in having a nose. Genetic factors contribute to the diversity of nose shapes among individuals, and scientific studies have provided insights into the specific genes involved. Understanding the heritability of physical traits, including nose shape, enhances our comprehension of human genetics and the intricate processes influencing our unique anatomical features.