Science, Maths & Technology
Meiosis and mitosis
...source of variation. It is conventional in genetics to represent each allele by a letter (either upper or lower case), printed in italics; alleles are given the same letter symbol to show that they are forms of the same gene. In the case of grain colour we will use the letter G (for grain) for the allele that is associated with purple grains and g for the different allele...