BISC 162 OLE MISS SYMULA TEST 1 ACTUAL

BISC 162 OLE MISS SYMULA TEST 1 (ACTUAL / )

QUESTIONS & VERIFIED CORRECT ANSWERS (A+ GRADED)

When looking at a phylogeny, like the one in the image, a node represents

• A common ancestor
• A speciation event
• One living species giving rise to two new species
• A or B
• All of the above - ---Answers---E

In the phylogeny in 41 which node(s) occurred most recently?

• 1
• 3
• 2
• 4
• 2 & 4 - ---Answers---E

A synapomorphy is

• The product of convergent evolution
• The result of an evolutionary reversal
• A shared derived characteristics
• A trait that was present in the ancestor of a group
• A phylogenetic tree - ---Answers---C 1 / 3

Members of genus X have antennae with a variable number of segments. Species A and B have 10 segments; species C and D have 9 segments; species E has 8 segments. In all other genera in this family (including genus Y) all species have antennae with 10 segments. Which of the following character states is a synapomorphy that would be useful for determining evolutionary relationships within genes X?

• 10 segment antennae in species A and B
• 10 segmented antennae in genus Y and in two species of

genus X

• Antennae with fewer than 10 segments in species C, D, and E
• 8 segment antennae in species E - ---Answers---B

Which of the following statements about reconstructing phylogenies is false?

• Traits found in the out group as well as in the ungroup are

likely to be ancestral traits

• Shared traits are generally assumed to be homoplastic until

they can be proven to be homologous

• Phyogenetic trees do not always provide an explicit time

scale by which to date the splits between lineages

• In a phylogenetic tree, branches can be rotated around any

node without changing the meaning of the tree

• A particular trait may be either ancestral or derived

depending not he point of reference of the phylogeny - --- Answers---B

• / 3

Which of the following statements describes a purpose for which biologists use phylogenetic trees?

• For human diseases once found only in other animals,

phylogenetic trees are helpful in determining when and where the infectious organisms first entered human populations.

• Phylogenetic trees are useful for determining how many

times a particular trait may have evolved independently within a lineages

• Phygenetic trees can be used to reconstruct ancestral traits
• All of the above - ---Answers---D

The most important attribute of a biological classification scheme is that is.

• Avoids the ambiguity created by the use of common names
• Reflects the evolutionary relationships among organisms
• Helps us remember organisms and their traits
• improves our ability to make predictions about the

morphology and behavior of organisms

• groups together organisms with similar traits - ---

Answers---B

Which of the following characteristics is unique to prokaryotes?

• lack of membrane bound organelles
• presence of cell walls
• presence of plasma membranes
• presence of a cytoskeleton
• / 3