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Ch. 32 - Deuterostome Animals

Chapter 31, Problem 8

Draw a phylogeny of major populations of modern humans that would reject the out-of-Africa hypothesis.

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Hi everyone. Let's look at our next problem here. It says given the following illustration, when did homo erectus diverged from homo habilis and were given a little diagram here? Ah There's a simple tree that lists different homo habilis, homo erectus, homo sapiens down at the bottom and then a more complex tree up above. And so let's look up on the tree above. We're looking at homo erectus. So here's homo erectus here and homo habilis or the species we're looking at and we're looking for when homo erectus diverged from homo habilis. And we see this connection here, you see branching off and if we trace that down to our timeline, We see that that that is between 2.0 and 1.5 million years ago. A closer to 2.0. So let's look at our answer choices, see which fits best. He says two million years ago. Well we're not quite at two million, so that's not our answer choice B says one million years ago. Well we're definitely longer ago than that quite a ways past it. So that's not an answer choice C says 1.8 million years ago, while choice D says 1.5 million years ago. Um well, million years ago, we're definitely past that according to our Diagram. So 1.8 million years ago would be the best description based on the diagram were given. So based on that illustration, when did homo erectus diverged from homo habilis choice C 1.8 million years ago. See you in the next video
Related Practice
Textbook Question

To estimate the relative abundance of the major phyla, calculate how many named species of arthropods, mollusks, and nematode worms exist per named species of chordate (the phylum containing vertebrates, including humans; see Table 30.1). Do you think these calculations are likely to be underestimates or overestimates? Why?

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Textbook Question

Compare amniotic eggs to placentas.

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Open Question

Which of the following nested monophyletic groups are correctly organized from largest (most inclusive) to smallest (least inclusive), showing your place in the tree of life?


a. Deuterostomes>Chordates>Vertebrates>Mammals

b. Animals>Mammals>Vertebrates>Primates

c. Chordates>Primates>Mammals>Hominins

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Textbook Question

Consider the evolution of protostomes and deuterostomes (this chapter): (1) Compare adaptations in protostomes and deuterostomes for living on land. (2) Recall that changes in the expression patterns of tool-kit genes in arthropods such as insects enabled a dramatic diversification of their segmented appendages and bodies. Design an experiment to test whether this concept applies to vertebrates.

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Textbook Question

Genetic diversity in living human populations is highest in Africa and decreases as a function of distance traveled by the human migration that left Africa many millennia ago. Draw a graph to show this trend. (Hint: What is the independent variable? What is the dependent variable? What kind of graph is appropriate for this kind of data? Add a label where you would expect to find a data point for the Yanomamö tribe of the Amazon rain forest in South America. Why is it important to use indigenous people for this study?

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Textbook Question

Humans possess which of the following traits? Select True or False for each trait. T/F triploblasty T/F parthenogenesis T/F viviparity T/F metamorphosis

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