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Related Concept Videos

Segregation in Fresh Concrete01:16

Segregation in Fresh Concrete

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Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Humans are very diverse and although we share many similarities, we also have many differences. The social groups we belong to help form our identities (Tajfel, 1974). These differences may be difficult for some people to reconcile, which may lead to prejudice toward people who are different. Prejudice is a negative attitude and feeling toward an individual based solely on one’s membership in a particular social group (Allport, 1954; Brown, 2010). Prejudice is common against people who...
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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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Often, psychologists develop surveys as a means of gathering data. Surveys are lists of questions to be answered by research participants, and can be delivered as paper-and-pencil questionnaires, administered electronically, or conducted verbally. Generally, the survey itself can be completed in a short time, and the ease of administering a survey makes it easy to collect data from a large number of people.
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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Related Experiment Video

Updated: Jul 27, 2025

Using the Race Model Inequality to Quantify Behavioral Multisensory Integration Effects
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Racial Segregation under Slavery.

Martin Ruef1

  • 1Duke University, USA.

Social Forces; a Scientific Medium of Social Study and Interpretation
|June 7, 2023
PubMed
Summary

Slavery, not just Jim Crow, created racial segregation in the US by isolating enslaved people and free people of color. This study reveals segregation patterns during the antebellum period, challenging prior assumptions.

Area of Science:

  • Sociology
  • History
  • Demography

Background:

  • Extensive research exists on racial segregation post-Civil Rights and under Jim Crow.
  • Less attention has been paid to slavery's role in shaping Black residential patterns in the US.
  • A common assumption is that slavery made racial segregation unnecessary or impractical.

Purpose of the Study:

  • To argue that slavery produced racial segregation during the antebellum period.
  • To examine the residential isolation of slaves and free people of color.
  • To challenge the assumption that slavery did not necessitate segregation.

Main Methods:

  • Utilizing data from the 1850 Census.
  • Employing an architectural survey of antebellum sites.
  • Applying racial threat theory to test hypotheses.

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Main Results:

  • Residential segregation of free people of color correlated with their local prevalence.
  • Residential segregation of slaves correlated with the prevalence of the slave population.
  • These patterns persisted even when controlling for economic competition and past slave rebellions.

Conclusions:

  • Slavery actively produced racial segregation through residential isolation.
  • Antebellum segregation patterns were influenced by the concentration of enslaved and free Black populations.
  • Findings necessitate a re-evaluation of slavery's impact on American residential segregation.