Problem 3 - Biology Today and Tomorrow Without Physiology

Question

The bones of a bird's wing are similar to the bones in a bat's wing. This observation is an example of _____. a. uniformity b. evolution c. comparative morphology d. a lineage

Step-by-Step Solution

Answer

Comparative morphology (option c).

Step 1: Understand the Concepts

To solve the exercise, we need to understand the terms given in the options: *uniformity* refers to the consistency and resemblance in characteristics; *evolution* is the process by which different kinds of living organisms are thought to have developed from earlier forms; *comparative morphology* is the study of the form and structure of organisms and their specific structural features; and a *lineage* refers to the descent or ancestral line of organisms.

Step 2: Analyze the Observation

The observation in the question refers to the similarity in bone structure of a bird's wing and a bat's wing. This involves comparing their forms and structures to note similarities, even though they belong to different species.

Step 3: Match the Observation to the Concepts

Based on the analysis, the observation of similar bone structures between a bird's wing and a bat's wing aligns with *comparative morphology*, as this field involves analyzing and comparing anatomical features across species.

Step 4: Select the Correct Option

After analyzing the observation and comparing it with the definitions, option c. comparative morphology best describes the observation since it specifically involves comparing structural similarities among different species.

Key Concepts

Comparative Anatomy

Comparative anatomy explores the structural similarities and differences among various species. It's a fascinating field that helps us dive deep into understanding how organisms are built and related. By studying anatomy, scientists can determine whether different species have common ancestors, which helps classify them based on evolutionary relationships.

In the exercise, the observation that bird and bat wings have similar bones is a perfect example of comparative anatomy. By comparing these anatomical features, we can identify patterns and shared structures across species. This comparison reveals evolutionary relationships and adaptations, showing us how species have evolved over time to fit their environments.

Evolution

Evolution refers to the gradual process where species change over generations through natural selection and genetic variations. It explains how species adapt, diversify and ultimately give rise to new species. This concept is the backbone of understanding biological diversity on Earth.

Through the lens of evolution, the existence of similar structures like the bird and bat wings can be understood as adaptations that evolved for the function of flight. Though coming from different ancestral lines, their wings show similar structural features due to convergent evolution—a process where unrelated species develop similar features when they adapt to similar environments.

Homologous Structures

Homologous structures are anatomical features that are similar in different species because they were inherited from a common ancestor. These structures may not always have the same function but share a similar basic structure.

In our example, while the bones in bird and bat wings are similar, they originally derived from a common ancestral limb structure. These homologous structures have been adapted over time for different functions in different environments. Understanding homologous structures allows scientists to trace the evolutionary paths of species, providing a clear picture of how different life forms are interconnected.

• Bird and bat wings look different externally, but internally, their structural similarity points back to their shared ancestry.
• This similarity results not from evolving wings independently but due to retaining the basic framework of their common ancestor's limb.