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Understanding Race

Chapter 13, Problem 6

For two populations of organisms to be considered separate biological species, they must be                   . a. reproductively isolated from each other; b. unable to produce living offspring; c. physically very different from each other; d. A and C are correct; e. A, B, and C are correct

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Hello everyone. And in today's video we have the following problem. If two populations to different populations are reproductively isolated, please keep this in mind because it is very important to solve the problem from each other. They must be regarded as. So let's just go over answer choices so that we can start solving this problem. Starting by by OEM by Omar. This group of a biotic factors that exists in a certain area. So examples could be the ph the temperature, the humidity and things like this that just excess or rain over a certain area. This is not really what the question is describing. So we're going to cancel this out. Then we have an ecosystem an ecosystem similar to buy OEM However, it's going to be biotic and biotic factors. So it's going to again include baby factors are going to be the ph light and temperature of a certain area and biotic factors which are going to be animals, living things that exist there. This is also not what the question is describing. So we're going to cancel it out. Then we have B which is community, this community are these groups of interacting species that are just working together or just interacting with each other. We said that they are isolated or the species in questions are isolated from each other. So we're not going to select community as or answer. And this all lifts us with separate biological species. Now, if we have separate species such as humans and dogs were going to be reproductively isolated because we cannot create offspring or just viable offspring and this is what makes us separate species or separate biological species, which is what the question is describing. So we're going to highlight answer choice a as being what the question is exactly describing. And our final answer thank you very much for sticking around until the end of this video, and I hope to see you on the next one.
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How are hypotheses about the evolutionary relationships among living organisms tested?
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Which of the following is an example of a prefertilization barrier to reproduction? a. A female mammal is unable to carry a hybrid offspring to term; b. Hybrid plants produce only sterile pollen; c. A hybrid between two bird species cannot perform a mating display; d. A male fly of one species performs a 'wing-waving' display that does not convince a female of another species to mate with him; e. A hybrid embryo is not able to complete development
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Textbook Question
According to the most accepted scientific hypothesis about the origin of two new species from a single common ancestor, most new species arise when                   . a. many mutations occur; b. populations of the ancestral species are isolated from one another; c. there is no natural selection; d. a supernatural creator decides that two new species would be preferable to the old one; e. the ancestral species decides to evolve
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Textbook Question
The biological definition of 'race' corresponds to all of the following except: a. the genealogical species concept; b. the idea that subgroups within the same species can be distinguished from each other by ancestry; c. there is a natural hierarchy of groups within a species from 'lowest' to 'highest' forms; d. it should be possible to identify races on the basis of shared allele frequencies among populations; e. races within a species are not reproductively isolated from each other.
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Textbook Question
All of the following statements support the hypothesis that humans cannot be classified into biological races except: a. There is more genetic diversity within a racial group than average differences between racial groups; b. Alleles that are common in one population in a racial group may be uncommon in other populations of the same race; c. Geneticists can use particular SNP alleles to identify the ancestral group(s) of any individual human; d. There are no alleles found in all members of a given racial group; e. There is genetic evidence of mixing among human populations occurring thousands of years ago until the present.
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Textbook Question

Similarity in skin color among different human populations appears to be primarily the result of                  . a. natural selection; b. convergent evolution; c. which biological race they belong to; d. A and B are correct; e. A, B, and C are correct

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