Of the following traits, which one is acquired (ie., not inherited)? (1 point)
O eye shape
O number and presence of dimples
O fingernail length
O skin tone
Of the given options, skin tone is the trait that is acquired rather than inherited.
Of the given options, the acquired trait is the O skin tone.
To determine which trait is acquired (not inherited) among the given options, we need to understand the difference between inherited traits and acquired traits.
Inherited traits are characteristics that are passed down from parents to offspring through genes and are determined by the individual's genetic makeup. These traits are present at birth and are generally not influenced by the environment or personal choices.
Acquired traits, on the other hand, are developed or obtained during an individual's lifetime through various factors such as experiences, environmental conditions, lifestyle choices, or personal preferences. These traits are not predetermined by genetics and can vary within a population.
Now, let's consider the traits mentioned in the question:
1. Eye shape: Eye shape is primarily an inherited trait. Different eye shapes, such as almond-shaped or round-shaped eyes, are determined by a combination of genetic factors and are typically passed down from parents to children. Therefore, eye shape is not an acquired trait.
2. Number and presence of dimples: Dimples are a genetic trait that is inherited. Some people naturally have dimples, while others do not. Dimples are formed due to a variation in the facial muscle structure and are determined by genetic factors. Thus, the number and presence of dimples are not acquired traits.
3. Fingernail length: Fingernail length is an acquired trait. It can be influenced by various factors such as personal grooming habits, nail care, and lifestyle choices. For example, individuals who frequently cut their nails short or engage in activities that cause nail breakage may have shorter nails. Conversely, individuals who let their nails grow without trimming might have longer nails. Therefore, fingernail length is an acquired trait.
4. Skin tone: Skin tone is primarily an inherited trait determined by genetic factors. The amount and type of melanin present in the skin are primarily responsible for variations in skin tone, which are passed down through generations. Although exposure to sunlight can cause temporary changes in skin color, these changes do not alter an individual's underlying genetically determined skin tone. Hence, skin tone is not an acquired trait.
Considering the explanations provided, fingernail length is the acquired trait among the given options.