Bozeman Science
Genotypes and Phenotypes
Complete heterochromia is a mutation that causes a person to have two different colored eyes. Class members explore how genotypes affect phenotypes. The instructor shows how changes in DNA can occur via mistakes in replication,...
Bozeman Science
Epigenetics
Epigenetic changes, caused by environmental factors, can be passed down several generations, meaning choosing to smoke can affect the life expectancy of your children and their children. Scholars explore epigenetics, learning that...
Amoeba Sisters
Multiple Alleles (ABO Blood Types) and Punnett Squares
Whatever you do in life, always give 100 percent—unless you are donating blood. A video explains how to solve Punnett squares with multiple alleles, in this case blood types. It includes what happens if the wrong type is added,...
Amoeba Sisters
Monohybrids and the Punnett Square Guinea Pigs
Introduce young biologists to monohybrid crosses and simple Punnett Squares. It includes explanations of dominant versus recessive and genotype versus phenotype by exploring different genetic combinations of guinea pigs.
Amoeba Sisters
Incomplete Dominance, Codominance, Polygenic Traits, and Epistasis!
Have you ever met twins or biological siblings with different skin colors? It's not unusual and a helpful video explains why. It includes incomplete dominance, codominance, polygentic traits, and Epistasis, and even explains...
Khan Academy
Khan Academy: Punnett Squares
Have fun learning how to use Punnett squares to calculate probabilities of different phenotypes. Provides examples of dihybrid crosses. independent assortment, incomplete dominance, codominance, and multiple alleles. [25:15]
Khan Academy
Khan Academy: Worked Example: Punnett Squares
Video tutorial investigates how to use Punnett squares to calculate probabilities of different phenotypes. Includes worked examples of dihybrid crosses, independent assortment, incomplete dominance, codominance, and multiple alleles....
Khan Academy
Khan Academy: Heredity and Genetics: Genetics 101 Part 4: What Are Phenotypes?
Discover how your observable traits, or phenotypes, are the result of interactions between your genes and environment.
Khan Academy
Khan Academy: Classical Genetics: Worked Example: Punnett Squares
Learn how to use Punnett squares to calculate probabilities of different phenotypes. Includes worked examples of dihybrid crosses. independent assortment, incomplete dominance, codominance, and multiple alleles. [25:17]
Bozeman Science
Bozeman Science: Hardy Weinberg Equation
In this video, Paul Andersen explains the elements in the Hardy-Weinberg equation; including the allele frequency and phenotype frequency. He begins with a brief explanation of phenotypes and genotypes. A sample problem is worked out and...