Evolutionary Evidence Through Genetics

The video explores DNA as a key evidence for evolution, highlighting shared genetic sequences among species, pseudogenes, and endogenous retroviruses as molecular fossils. It discusses the conservation of essential genes, mutations as molecular clocks, and gene duplication as a source of evolutionary innovation. Horizontal gene transfer in bacteria is also covered, demonstrating rapid adaptation and evolution in real time.

What percentage of DNA do humans share with chimpanzees, suggesting a recent common ancestor?

• 98.8%

• 95.5%

• 90.2%

• 99.9%

What is the significance of the universal genetic code in the context of evolution?

• It shows that all life forms have different origins.

• It suggests that evolution is not a valid theory.

• It demonstrates a shared evolutionary origin among all life forms.

• It indicates that only mammals share a common ancestor.

What is the role of pseudogenes in understanding evolutionary history?

• They are genes that have no relation to evolution.

• They are non-functional genes that act as molecular fossils.

• They are active genes coding for new proteins.

• They are genes that only exist in extinct species.

How do pseudogenes like the gulo gene provide evidence for shared ancestry among primates?

• They are unique to each primate species.

• They are non-functional due to identical mutations in primates.

• They have no relation to evolutionary history.

• They are functional in all primates.

What are endogenous retroviruses (ERVs) and their significance in evolution?

• They are viruses that have no genetic material.

• They are viruses that only affect humans.

• They are remnants of ancient viruses found in the same locations in related species' genomes.

• They are active viruses causing diseases.

How do scientists use mutations to estimate the time since species diverged from a common ancestor?

• By comparing the rate of mutations in certain genes.

• By observing physical traits.

• By studying behavioral patterns.

• By analyzing fossil records.

What does the conservation of genetic sequences across different life forms indicate?

• A random occurrence with no significance.

• An independent origin of species.

• A deep evolutionary relationship.

• A lack of evolutionary change.

What is gene duplication and its role in evolution?

• It is the process of genes becoming inactive.

• It is the accidental copying of a gene, leading to new functions.

• It is the merging of two different genes.

• It is the process of genes being deleted.

What is horizontal gene transfer and its significance in evolution?

• It is the transfer of genes within the same organism.

• It is the transfer of genes from parents to offspring.

• It is the movement of genes between species, aiding rapid adaptation.

• It is the process of genes being lost over time.

Which gene family in humans is an example of gene duplication leading to specialized functions?

• The keratin gene family.

• The insulin gene family.

• The globin gene family.

• The collagen gene family.