Study Guide

Genetics Topics

Mendelian Genetics

Gregor Mendel (1822–1884), an Austro-Hungarian monk, discovered what is considered to be...

Genetic Linkage

Mendel's second law, the law of independent assortment, concerns the random separation of...

Modification of Dominance Relationships

As it turns out, Mendel was a lucky man. He picked, partly by accident, characters and...

Lethal Alleles

There's also another factor that can affect what offspring you get to see, one that can make an...

Gene Interactions

Let's take another few steps away from the beauty and simplicity of Mendelian genetics. Kind of...

Sex Determination and the Inheritance of Sex Linked Traits

Quantitative Genetics

Most traits do not fall in discrete, qualitative categories (round or wrinkled, present or...

Extranuclear Genetics

DNA is not restricted to the nucleus: it's also found in two cytoplasmic organelles, the...

The Chi-Squared Test

Despite the misuse and abuse they get in everyday life, when you're studying genetics, statistics...

Common Mistakes

If you are analyzing a cross involving two genes, if the ratio of F2 phenotypes from a...

Test Your Knowledge

1. How do the genotype and phenotype of an organism relate to each other? (The genotype is the...

Made From Trees

Allen, G., Carlson, E., Lombardo, P., Micklos, D., Selden, S., & Witkowski, J. A. Image...