Homologous Structures In Anatomy Across Species

The video explains homologous structures, which are anatomical structures that are similar in form but serve different functions across species. Examples include the human arm, cat leg, horse leg, bat wing, and dolphin flipper. These structures share similar bones, such as the humerus, radius, and ulna, but are adapted for different uses like grasping, walking, flying, and swimming. Homologous structures suggest evolutionary relationships, indicating a common ancestor among species. The video concludes with a reminder to practice kindness.

What is the primary characteristic of homologous structures?

• They have identical functions.

• They are structurally different but functionally similar.

• They are structurally similar but functionally different.

• They are found only in mammals.

Which of the following is NOT an example of a homologous structure?

• Bat wing

• Fish fin

• Cat leg

• Human arm

What bones are commonly found in homologous structures?

• Humerus, radius, and ulna

• Femur and tibia

• Pelvis and scapula

• Skull and spine

How many phalanges does a dolphin's flipper have?

• Three

• Four

• Five

• Six

Which function is NOT associated with homologous structures?

• Running

• Photosynthesis

• Flying

• Swimming

What function does a horse's homologous structure primarily serve?

• Flying

• Grasping

• Swimming

• Running

What can homologous structures help scientists infer?

• The diet of an organism

• The evolutionary relationships among organisms

• The lifespan of an organism

• The habitat of an organism

Which species is NOT mentioned as having homologous structures in the video?

• Bird

• Cat

• Human

• Dolphin

What is suggested by the presence of homologous structures in different species?

• They evolved independently.

• They share a common ancestor.

• They have identical DNA.

• They live in similar environments.