1. Analogy and homology are important concepts used in comparing species. Traits are homologous if..

1. Analogy and homology are important concepts used in comparing
species. Traits are homologous if they are derived, evolutionarily and
developmentally, from the same source structure. Traits are analogous if they
have similar functions but are derived, evolutionarily and developmentally, from
different source structures. A classic example of analogous structures is
insect wings and bat wings. Which of the following pairs of structures are analogous
and which are homologous?

a. The dorsal fins of a porpoise and a salmon

b. The flippers of a porpoise and the pectoral fins (front

1. Analogy and homology are important concepts used in comparing
species. Traits are homologous if they are derived, evolutionarily and
developmentally, from the same source structure. Traits are analogous if they
have similar functions but are derived, evolutionarily and developmentally, from
different source structures. A classic example of analogous structures is
insect wings and bat wings. Which of the following pairs of structures are analogous
and which are homologous?

a. The dorsal fins of a porpoise and a salmon

b. The flippers of a porpoise and the pectoral fins (front fins)
of a salmon

c. The jointed leg of a ladybird beetle and a robin

d. A rhesus monkeys tail and a humans coccyx

e. The bright red bracts (modified leaves) of a poinsettia and
the green leaves of a rose

f. Red bracts on a poinsettia and red petals on a rose

9. An evolutionary tree showing the relationships among five
living species of snails. Draw a genealogical pedigree of your family or a
friends family, starting with the oldest and continuing to the youngest generation.
Compare the pedigree to the evolutionary tree. How are evolutionary trees and
pedigrees similar? How are they different?

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