Mendelian genetics,Punnett square. Diagram showing the genetics of seed colour in peas,as discovered by Gregor Mendel in the 1850s and 1860s. The genes controlling seed colour are Y and y,with Y dominant over y. The combinations YY and Yy produce yellow seeds. The combination yy produces a green seed. The pure parent lines (top) combine gametes (pollen and eggs) to produce a first generation (F1) of yellow seeds (Yy). This self-fertilises to produce the second generation (F2). The colour proportions of the F2 generation of seeds are shown in the form of a Punnett square,with a quarter of the seeds being green (yy,bottom) and three-quarters yellow | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 3403 px × 5238 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |