what is true about homologous structures? course hero sci 115

by Lionel Schroeder 8 min read

What is homologous structure?

STUDY Flashcards Learn Write Spell Test PLAY Match Gravity Created by David_Salgado_1 Terms in this set (9) Homologous structure Structures that are similar in different species of common ancestry Vestigial structure A structure that is present in an organism but no longer serves its original purpose Inherited Genetic markers Ancestor

What are homologous and vestigial structures?

Homologous structure Structures that are similar in different species of common ancestry Vestigial structure A structure that is present in an organism but no longer serves its original purpose Inherited

Which structures are similar in different species of common ancestry?

Structures that are similar in different species of common ancestry Vestigial structure A structure that is present in an organism but no longer serves its original purpose Inherited Genetic markers

What is the main idea of homologous structures?

What is a homologous structure? It is an example of an organ or bone with similar underlying anatomical features found in different animals. These structures support the idea that the different animals descend from a common ancestor and serve as evidence of evolution.

What are homologous structures Short answer?

Homologous structures are similar physical features in organisms that share a common ancestor, but the features serve completely different functions. An example of homologous structures are the limbs of humans, cats, whales, and bats.

What does homologous structure mean quizlet?

Homologous structure. Structures that are similar in different species of common ancestry.

What are 3 examples of homologous structures?

Following are some examples of homology: The arm of a human, the wing of a bird or a bat, the leg of a dog and the flipper of a dolphin or whale are homologous structures. They are different and have a different purpose, but they are similar and share common traits.

Which is accurate about the description of homologous structure?

Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not have the same function in the descendants.

Which homologous structure is incorrect *?

Conclusion: Insect wings and birds wing are analogous organs. So, the statement' Insect wings and birds wing are homologous organ' is incorrect.

What do homologous structures have in common quizlet?

Homologous structures are when two organisms have a similar structure but have a different function. How do homologous structures support evolution? Structures are similar, which shows a common ancestor. Analogous structures are when two organisms have different structures but serve a similar function.

What are examples of homologous structures quizlet?

Examples of homologous structures are the bones of a cat's leg, bird's wing, whale's flipper and a human arm. They are homologous because they formed from the same embryonic tissue but developed into different mature structures.

Which statement best describes how homologous structures evolve?

Which statement best describes how homologous structures evolve? A basic structure inherited from a common ancestor may evolve different variations in different species.

How do you identify a homologous structure?

0:121:53Homologous Structures vs Analogous Structures | Key DifferencesYouTubeStart of suggested clipEnd of suggested clipSo homologous structures have a similar structure meaning they're anatomy or the bone structure isMoreSo homologous structures have a similar structure meaning they're anatomy or the bone structure is similar. They have a differing function so a wing versus an arm versus a fin for example.

Which of the following is homologous?

So, the correct answer is 'Wings of birds and pectoral fins of fish'

Which sets of structures are homologous?

Homologous structures, such as a whale's flipper and a bird's wing, are structures that do not look exactly the same, or perform the same function but are structually similar suggesting that they share a common ancestor.

Homologous Meaning and Definition

The prefix of homologous (homo) means same and the latin root of the word means agreeing. Therefore, the term homologous means having the same structure and position or consistency.

Homologous Traits

Throughout time, organisms have evolved from their ancestors to adapt to their environment and acquire characteristics that allow them to survive and reproduce successfully. Evolutionary biologists that study genetics of organisms noticed similarities in structures of these organisms even when the function was not the same.

Identification of Homologous Traits

Homologous traits are identified by studying developmental, morphologic and even molecular features such as bone structures of organisms across many different lineages. Scientists will study the embryos of various organisms and compare these structures as they develop into adulthood.

Homologous Organs

An organ is a part of an organism that serves a vital function. Therefore, a homologous organ refers to organs of different organisms that have similar positions and structure, but different functions. An example of this would be the forelimbs of a frog and a lizard. They both have anatomically similar structure, but different vital functions.

Role of Homologous Organs

Scientists have come up with different methods to identify homologous organs that point towards evidence for evolution and life evolving from a common ancestor. Some ways to identify these traits are through comparative anatomy, embryology, fossil evidence, phylogeny (the history of evolution), and DNA analysis.

Homologous Structure Examples

There are many different examples of homologous structures between different organisms.

Teaching Homologous Structures, Chromosomes and Organs

In this exercise, students will get a deep appreciation for homologous structures, chromosomes and organs as they develop their own lesson plan to teach other students about these concepts.