Mendelian Genetics. The science of modern genetics had its humble beginning in the garden of an Austrian monk in the 1860s. The monk was Gregor Mendel, and his contribution to the study of heredity is discussed in every biology textbook.
The seven characteristics that he observed can be seen in the illustration to the right.
Fortunately these traits were carried on different pairs of chromosomes.
By controlling the transfer of pollen, he was able to conduct cross-fertilization experiments.
Did you know that although Mendel did his work in the 1860’s, it was ignored and not rediscovered until 1901?What did Mendel do??
AA,AO,AB,BB,BO, or OO
A and B are carbohydrates found on the surface of the red blood cell, while O is an absence of either A or B. When both A and B are present, they are said to be codominant.
Thomas Hunt Morgan and his students were leaders in the study of crossing over and its role in genetic diversity.
Determining the frequency of recombinant genotypes allowed researcher to determine the relative position of genes on a chromosome.Linkage and Crossing over
systems for sex determination that can be found in the animal kingdom.
Other systems for sex determination include the X-O system of grasshoppers and some other insects, the Z-W system of birds and a few other animals.
Sounds fairly simple…but…
Often it is a bit more complicated than this. Take a few minutes and go to the following website. Take the role of selection committee member and determine the eligibility of Jane Doe to compete. You may be surprised!
http://www.hhmi.org/biointeractive/gender/index.html and go to gender testing of female athletes