Mendelian genetics,Punnett square. Diagram showing the genetics of seed colour and shape in peas,as discovered by Gregor Mendel in the 1850s and 1860s. The colour genes are Yy (yellow-green) and the shape genes are Rr (round-wrinkled). Yellow (Y) and round (R) are dominant. The pure parent lines (top) combine gametes (pollen and eggs) to produce a first generation (F1) of yellow round seeds (YyRr). This self-fertilises to produce the second generation (F2). The colour and shape ratios in this F2 generation are shown in the form of a Punnett square,with the ratios being 9:3:3:1 of phenotypes (yellow round,yellow wrinkled,green round,and green wrinkled) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 3403 px × 5238 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |