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BSC-116-001 Chapter 26 Exam Questions Correctly Answered. Animals that possess homologous structures probably _____. A. have increased genetic diversity B. evolved from the same ancestor C. are not related D. are the result of convergent evolution E. are the result of similar environmenta...

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  • August 4, 2024
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BSC-116-001 Chapter 26 Exam
Questions Correctly Answered.

Animals that possess homologous structures probably _____.

A. have increased genetic diversity

B. evolved from the same ancestor

C. are not related

D. are the result of convergent evolution

E. are the result of similar environmental pressures in different evolutionary lineages - CORRECT
ANSWER B. evolved from the same ancestor



Homologous structures are similar because of common ancestry.



By definition a clade is _____.



A. parsimonious

B. polyphyletic

C. paraphyletic

D. analogous

E. monophyletic - CORRECT ANSWER E. monophyletic



A clade is defined as a group that includes an ancestral species and all of its descendants.



Fossil evidence indicates that some dinosaurs had feathers. If birds are indeed descended from
dinosaurs, feathers are what kind of character?



A. analogous character

B. shared derived character

, C. polyphyletic character

D. cladistic character

E. shared ancestral character - CORRECT ANSWER E. shared ancestral character



A shared ancestral character is one that originated in an ancestor of the taxon. In this case it appears
that feathers originated in some dinosaur lineages and were passed down to birds.



What process actually increases the number of genes in an organism's genome?

What process actually increases the number of genes in an organism's genome?



A.mutation

B.parsimony

C. gene duplication

D. cladistics

E. independent assortment - CORRECT ANSWER C. gene duplication



Mutations that lead to duplications actually increase the number of genes in a genome. When an
organism has two copies of a gene, one can perform its function while the other is free to accumulate
mutations to the point that it may take on a new and advantageous function.



Why do researchers use rRNA in investigations of relationships between taxa that diverged hundreds of
millions of years ago?



A. rRNA is traditionally the nucleic acid chosen for recent comparisons.

B. rRNA is never the nucleic acid chosen for comparisons.

C. rRNA cannot mutate.

D. DNA coding for rRNA changes relatively slowly.

E. rRNA mutates rapidly. - CORRECT ANSWER D. DNA coding for rRNA changes relatively slowly.



Molecular clocks are based on the idea that _____.

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