Exploring Gene Flow in Biology

The video explains the concept of gene flow, which is the transfer of genes between individuals in a species, contributing to diversity. It highlights Charles Darwin's study of finches on South American islands, showing how physical barriers can stop gene flow, leading to the evolution of new species. The video emphasizes the importance of gene flow in maintaining species homogeneity and preventing extinction.

What is gene flow primarily responsible for within a species?

• Decreasing genetic diversity

• Creating new genes

• Maintaining genetic diversity

• Eliminating old genes

Why do individuals within the same species exhibit differences?

• Because of their age

• Owing to different sets of genes

• Because of where they live

• Due to the food they eat

How does gene flow contribute to the survival of a species?

• By stopping the species from evolving

• By ensuring all individuals are identical

• By preventing any new traits from appearing

• By keeping the species genetically diverse

What illustrates the importance of gene flow in maintaining species diversity?

• The uniformity of species

• The creation of entirely new genes

• The variation within a species

• The stability of ecosystems

What was the natural barrier that caused the finches to evolve differently according to Darwin's study?

• Forests

• Oceans

• Rivers

• Mountains

What trait differed among finches on islands with different food sources?

• Feather color

• Beak size

• Wing size

• Eye color

What did Darwin observe in the finches that led to his theory of natural selection?

• Their physical adaptations to food sources

• Their dietary habits

• Their migration patterns

• Their mating rituals

What can happen to a species when gene flow is interrupted?

• It becomes stronger

• It can lead to the creation of new species

• It will definitely go extinct

• It remains unchanged

What is a potential consequence of a species becoming genetically isolated?

• Increased lifespan

• Decreased competition

• Inability to reproduce with original population

• Faster evolution

Why are humans considered to be part of the same species?

• Owing to gene flow and shared genetic traits

• Because of our intellectual capabilities

• Because of our similar cultures

• Due to our ability to communicate