This study guide compares asexual and sexual reproduction and also looks at meiosis, genetic variation, and life cycles |

In this lesson, history meets science as students investigate whether an event in the 1860s that limited genetic variation among Navajos may have led to both children of a modern-day Navajo couple being born with a rare genetic disease. To investigate this theory, students will use a basic simulation model to track gene frequencies across multiple generations.

Genes and intelligence: The 3% solution | The Economist. A potent source of genetic variation in cognitive ability has just been discovered.

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Mammal-hunting orcas have a genetic variation that helps them store vital nutrients between meals.

DNA INTERACTIVE NOTEBOOK, 57 pages, DNA, DNA REPLICATION, Deoxyribonucleic acid, genes, chromosomes, genetics, genetic variation, RNA, transcriptio...

People have a surprising amount of genetic variation.

During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.

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Health experts say that ADHD (attention deficit hyperactivity disorder) is the most common behavioral disorder that starts during childhood.

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