In a follow-up study in 2020, Joshua Akey and colleagues discovered that the genomes of modern Africans contain a small amount of Neanderthal DNA due to migration of some Europeans back to Africa after interbreeding with Neanderthals. Given the large amount of variation within human populations, how would you know whether there is a significant difference in percentage of Neanderthal DNA between modern Europeans and modern Africans?

검증된 단계별 안내

Formulate a hypothesis: Determine if there is a significant difference in the percentage of Neanderthal genes between students with blue eyes and those with brown eyes. The null hypothesis (H0) could be that there is no difference, while the alternative hypothesis (H1) could be that there is a difference.

Collect data: Sequence the DNA of students with blue eyes and those with brown eyes to determine the percentage of Neanderthal genes in each individual's genome.

Organize the data: Group the data into two categories based on eye color (blue and brown) and calculate the mean percentage of Neanderthal genes for each group.

Perform a statistical test: Use an appropriate statistical test, such as a t-test, to compare the means of the two groups. This will help determine if any observed difference is statistically significant.

Interpret the results: Analyze the p-value obtained from the statistical test. If the p-value is less than the chosen significance level (commonly 0.05), reject the null hypothesis and conclude that there is a significant difference in the percentage of Neanderthal genes between the two groups.

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Neanderthal DNA in Modern Humans

Neanderthal DNA refers to the genetic material inherited from Neanderthals, an extinct species closely related to modern humans. After interbreeding events between Neanderthals and early Homo sapiens, some Neanderthal genes were integrated into the human genome. Today, non-African populations typically have about 1-4% Neanderthal DNA, which can influence various traits and susceptibilities.

Genetic Variation and Eye Color

Eye color is a polygenic trait primarily determined by the interaction of multiple genes, with the OCA2 and HERC2 genes playing significant roles. Variations in these genes can lead to different eye colors, such as blue or brown. Understanding genetic variation is crucial for studying how certain traits, like eye color, might correlate with other genetic factors, such as Neanderthal DNA.

Statistical Significance in Genetic Studies

Statistical significance is a measure used to determine if the observed differences in data are likely due to chance or represent a true effect. In genetic studies, statistical tests, such as t-tests or ANOVA, can be used to compare the percentage of Neanderthal DNA between groups (e.g., blue-eyed vs. brown-eyed students) to assess if any observed differences are significant, considering sample size and variability.

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교과서 질문

A revolution in the study of human evolution is under way thanks to the invention of techniques that enable DNA sequencing of not only modern humans, but also ancient humans. Modern humans (Homo sapiens) and archaic humans called Neanderthals (H. neanderthalensis) shared a common ancestor in Africa but diverged in different geographic areas. When modern humans migrated out of Africa and dispersed around the world starting about 100,000 years ago, they overlapped with Neanderthals in Europe. This scenario is best described as

a. Species living in sympatry following allopatric speciation

b. Species living in sympatry following sympatric speciation

c. Species living in allopatry following allopatric speciation

d. Species living in allopatry following sympatric speciation

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교과서 질문

A revolution in the study of human evolution is under way thanks to the invention of techniques that enable DNA sequencing of not only modern humans, but also ancient humans. Before the application of DNA sequencing to fossils, which species concept was most useful for distinguishing human fossils? What is one disadvantage of this approach?

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교과서 질문

Svante Pääbo and colleagues were the first to sequence the Neanderthal genome from fossils and compare the sequences to modern humans. According to the data shown here, did the two species interbreed when they overlapped in Europe? Explain.

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