Gorilla Opossum FoxHumanBearRhesus|DogCapuchin Monkey Monkey Yes Yes No Yes No Y
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Question
Gorilla Opossum FoxHumanBearRhesus|DogCapuchin Monkey Monkey Yes Yes No Yes No Yes Yes Yes No No No Yes Yes No No Yes Yes Yes Yes No No No NoYesNo NoYesNo Yes Tail Placenta Marsupial pouch Opposable thumb Prehensile tail Fingernails Habitual bipedal No Yes No Yes No Yes Yes Yes 0 Yes Yes Yes Yes 0 0 0 locomotion Yes Yes Yes Yes Opposable big toe Yes Yes Yes Yes Yes Yes Yes Yes Hair Menstrual cycle Number of pairs of 2 Yes No No No No 0 No upper incisors No Yes No No Yes Carnassial teeth 1. (2 point) Give two examples of characters from the table that are lost in later lineages. (2 points) Give two examples of characters in the table that has evolved in two separate lineages (convergent evolution) 2.Explanation / Answer
Two examples of characters which have been lost in later lineages are--
1] Carnesial teeth -- Though all the given examples are carnivorous, the carnisial teeth are found only in dogs and foxes and are lost in the upper animals.
2] Menstrual cycle -- Only human beings have a monthly menstrual cycle and can breed throughout the year. All other animals named in the chart breed only in season. And human beings occupy the highest notch in the evolutionary tree.
Two characters which have evolved
1] Walking on 4 limbs- lOf all the given examples, only humans show bipedal locomotion. Even gorillas, which are closely related to humans, move on four limbs.
2] Tail-- Tail has evolved convergently in the above mentioned animals. Tail is present in primates like opposum, bears and monkeys as well as in dogs and foxes.
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