Question

Part 3. Determining character states: an introduction to primate systematics Instructions: Compare the six labeled skulls and fill in the chart by assigning character states to the characters using 0, 1, or 2. Then, use the information from the completes chart to answer the following questions. Score the characters in the following manner: Post-orbital bar: 0 = absent 1 = present Post-orbital closure: 0= absent 1 - present Tooth comb: 0= absent 1 = present Dental formula: 0 = 2.1.3.3. 1 = 2.1.2.3. 2 = other Position of foramen magnum: 0 = back of skull 1 = bottom of skull Table 2: characteristics Skull Skull B Skull C S kull D Skull E Skull F Post-orbital bar Post-orbital closure Tooth comb 2002 Dental formula Position of foramen magnum 1. Skulls B, C, D, E, and F are primates. Which character state is a shared derived feature for all primates (i.e., which character state do all primates share)? Note: All primates living and extinct have this feature.

Answer 1

for all primate Shared derived feature B, C, D, E,F have Post orbital bar in their skull, 8.2 ANS Haplo shine and strepsir hine diff in two character states chol Strepsizhine have tooth comb in their tooth but the haploshine don't have -ch-2 Haploshine have post orbital Closure in their skill but the strepsirhine dout have 8.3 ANS platy shine and Catarshine differ in a character state that ch platyarhine have the 2,1,3,3 dental formula but other's dont have the 2,133 dental formala.

for all primate Shared derived feature B, C, D, E,F have Post orbital bar in their skull, 8.2 ANS Haplo shine and strepsir hine diff in two character states chol Strepsizhine have tooth comb in their tooth but the haploshine don't have -ch-2 Haploshine have post orbital Closure in their skill but the strepsirhine dout have 8.3 ANS platy shine and Catarshine differ in a character state that ch platyarhine have the 2,1,3,3 dental formula but other's dont have the 2,133 dental formala.

ANS Hominin have post orbital bar. and post orbital closure in their skull and tooth comb is absent, dental fomula is 2013,3 and position of forman magnum is bottom of the skull.

ANS Hominin have post orbital bar. and post orbital closure in their skull and tooth comb is absent, dental fomula is 2013,3 and position of forman magnum is bottom of the skull.