Crash Course
Population Genetics: When Darwin Met Mendel - Crash Course Biology
Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and Darwin, and by means of the Hardy-Weinberg equation.
SciShow
The Truth About Gingers
There are many names for them, but here at SciShow we lovingly refer to them as 'Gingers'. In this episode, Hank explains what gene is responsible for the creation of redheads.
SciShow
Teratomas: What Tumors with Teeth Can Teach Us About Stem Cells
There’s one kind of tumor that’s basically straight out of a horror movie...
SciShow
How Do Seedless Watermelons Reproduce?
Seedless watermelons are basically the best thing ever. But they’re also a delicious paradox. Seeds are a key part of plant reproduction. So how do you breed a plant that doesn’t make any seeds?
Bozeman Science
Mutations
Paul Andersen describes the major mutations found in the living world. He starts with an analogy comparing the information in DNA with the information in a recipe. Changes in the DNA can result in changes to the protein, like changes in...
SciShow
Common Misconceptions About Evolution
Evolution is particularly vulnerable to misunderstandings around the scientific language. SciShow clears up some confusing language!
Bozeman Science
Evidence of Evolution:
Paul Andersen describes pieces of evidence that Charles Darwin used to support the idea of evolution and his process of natural selection. He begins with the following evidence use in the Origin of Species; artificial selection,...
Bozeman Science
Chromosomal Genetics
Paul Andersen explains aspects of genetics that were not covered by Gregor Mendel. He begins with the following topics; incomplete dominance, codominance, epistasis, multiple alleles, and multiple genes. He then explains how linked genes...
MinuteEarth
Why Bird Penises Are So Weird
Male birds have the largest genital diversity of any class of animals because their sex chromosomes make it easy to pass male-helping mutations down the line. ___________________________________________ To learn more, start your googling...
SciShow
3 Genes That Give People Superpowers
There are genetic mutations in the population today that can grant people some seemingly superhuman abilities.
Bozeman Science
Population Variation
Paul Andersen explains the importance of genetic variation within a population. He begins with a discussion of the devil facial tumor that is a form of cancer transferred between Tasmanian devils. He then explains how a decrease in...
Bozeman Science
What is Cancer?
In this video Paul Andersen answers the very simple question: What is cancer? He explains how damage to the DNA can create uncontrolled cell growth. He explains how malignant tumors can spread the disease throughout the body and gives...
Bozeman Science
Linked Genes
Paul Andersen explains how linked genes behave and how linked genes were discovered. He shows how linked genes would be reflected in a dihybrid cross using a fruit fly simulator. He uses chromosome-based punnett squares to explain why...
Bozeman Science
Examples of Natural Selection
Paul Andersen details examples of natural selection in the world. He starts by explaining how changes in global temperatures are causing plants to adapt. He explains how mutations cause changes in phenotype which give organisms varying...
Bozeman Science
Natural Selection
Paul Andersen explains how natural selection is a major mechanism in evolution. The video begins with a discussion of Charles Darwin and the details of natural selection. The data of the peppered moth during the industrial revolution is...
The Daily Conversation
Human-Animal Chimeras, The Future of Medicine?
New ReviewAn ethically questionable new genetic technique attempts to grow human organs inside of pigs.
Curated Video
Species Change Overtime
New ReviewThis video describes various ways that species change over time such as variation, binary fission, adaption, mutation, envirvonmental changes, and extinction.
Curated Video
Mismatch Repair of DNA
Mismatch repair (MMR) is a DNA repair mechanism that corrects base-pairing errors and small insertions or deletions that escape proofreading during DNA replication. A protein complex identifies the mismatch, excises a section of the...
Curated Video
Complementation Test: Benzers Experiment
A complementation test (or cis-trans test) is used to determine whether two recessive mutations causing the same phenotype occur in the same gene or in different genes. In the trans configuration, if the mutations are on different genes,...
Curated Video
Ames Test
Ames test was developed by Bruce N. Ames in 1970s to test for determining if the chemical is mutagens. Ames test it is a biological assay to assess the mutagenic potential of chemical compounds. It utilizes bacteria to test whether a...
Curated Video
Types of Mutagens: Phycial, Chemical & Biological
Mutagenesis is the process of inducing mutations using physical, chemical, or biological mutagens, though mutations can also occur spontaneously during DNA replication. Physical mutagens include ionizing radiation (X-rays, gamma rays)...
Curated Video
Ames Test for the Detection of Potential Mutagen
The Ames test, developed by Bruce Ames in the 1970s, is a bacterial reverse mutation assay used to assess whether a chemical is a mutagen by observing its ability to induce reverse mutations in auxotrophic bacterial strains (e.g.,...
Curated Video
Luria Delbruck Experiment (Fluctuation Test)
The 1943 Luria–Delbrück experiment, known as the "Fluctuation Test," demonstrated that mutations in bacteria occur randomly rather than as a directed response to environmental stress, such as viral infection. By showing wide variation in...