A challenge in human genetics is to recognize genotypes without recourse to the deliberate cross and the F2 generation (The second filial generation, produced by self-crossing the F1). For this reason the study of human genetics relies so heavily on pedigree analysis. Phenotypic data is collected from several generations and charted. Many MCATs have included pedigree analysis in one form or the other over the years. The prototypical question is whether the trait is dominant or recessive. Here are some rules to follow. Remember that if a trait is dominent: 1) affected individuals have at least one affected parent. 2) the phenotype appears every generation and 3) two unaffected parents only have unaffected offspring (having the opposite occur way off in the corner of the chart is an old test-writer trick). Also, while a dominant allele tends not to skip generations, it can skip if masked by some other allele or process, so be sure to read the passage carefully.












The WikiPremed MCAT Course is a comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum. Please read our policies on Privacy and Shipping & Returns.  Contact Us. MCAT is a registered trademark of the Association of American Medical Colleges, which does not endorse the WikiPremed Course. WikiPremed offers the customers of our publications or our teaching services no guarantees regarding eventual performance on the MCAT.


Creative Commons License
WikiPremed is a trademark of Wisebridge Learning Systems LLC. The work of WikiPremed is published under a Creative Commons Attribution NonCommercial ShareAlike License. There are elements of work here, such as a subset of the images in the archive from WikiPedia, that originated as GNU General Public License works, so take care to follow the unique stipulations of that license in printed reproductions.