12 Questions
What is the main reason for the creation of the three domains (bacteria, eukarya, archaea) classification system?
To better understand the relationships among different species
Which of the following structures are considered homologous?
Vertebrae in humans, cats, whales, and bats
What is the main difference between homologous and analogous structures?
They have different evolutionary origins
How can traits be used in studying organisms?
To understand inheritance patterns
Which of the following is classified as a character?
Fur color in mammals
In what aspect do homologous and analogous structures differ?
Their shared evolutionary history
Why are monophyletic clades preferred over paraphyletic and polyphyletic groupings?
They accurately represent evolutionary groups
What distinguishes a paraphyletic group from a monophyletic clade?
Includes an ancestral species and some, but not all, descendants
Which of the following is a shared derived character?
Character unique to a particular clade
What is the main purpose of using maximum parsimony in determining evolutionary relationships?
Minimize the number of evolutionary changes
Why is it challenging to estimate evolutionary time accurately using molecular clocks?
Different genes may evolve at different rates
With reference to protists, why is the group no longer considered to exist?
Protists present variations that eliminate a single common ancestor
Test your knowledge on the changes in the classification system from 'Plantae and Animalia' to the current system with 3 domains. Understand the three domains: Bacteria, Eukarya, and Archaea, and learn to differentiate between homologous and analogous characters with examples.
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