Development of Classification Systems Flashcards

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How have technological advancements in the 20th century improved biological classification?

Technological advancements have improved biological classification by improving the study of internal structures using microscopes, understanding biochemical processes inside cells, and sequencing genomes.

What has the development of microscopes allowed scientists to do?

The development of microscopes has allowed scientists to distinguish structures within cells, leading to a more scientific approach to classification.

How do scientists use DNA sequences to determine the relatedness of different species?

By comparing DNA sequences in different species, scientists can tell how closely related they are. Fewer differences in DNA sequences indicate closer relatedness.

What is the Three-Domain System?

The Three-Domain System, developed by Carl Woese, classifies all organisms into three domains: Archaea, Bacteria and Eukaryota.

Each domain is further divided into smaller groups like kingdom, phylum, class, order, family, genus and species.

What organisms are included in the domain Archaea?

The domain Archaea includes single-celled organisms often found in extreme environments, such as hot springs and salt lakes.

Why did Carl Woese propose a separate domain for Archaea?

Carl Woese proposed a separate domain for Archaea because chemical analysis showed that archaea significantly differ from bacteria.

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