Learning objectives – to learn how to interpret genetic diagrams and learn
how genes are passed on and how they present themselves Genetic
diagrams can be used to show the several possibilities that may occur within
the genes of the offspring.
The initial pioneer of genetic experiments was a scientist called Gregor
Mendel who performed experiments on pea plants in the 19th century. He
investigated the height of pea plants. The first experiment included tall pea
plants and dwarfed pea plants. He crossed the two types and observed the
offspring. He found that all the offspring were tall pea plants.
This is illustrated in the genetic diagram below. A capital T highlights the tall
pea plant and a lower case t highlights a dwarfed pea plant.
He then crossed the offspring and found that the results were slightly different.