Heart rate or pulse I think.
The stronger survived and the weaker passed on... Those with a weaker immune system had trouble with sickness and usually ended up passing on but those with strong immune systems were stronger and healthier and lived.
Parental Phenotypes: Smooth Green × Smooth Green
Parental Genotypes: SsGg × SsGg
Parental Gametes: SG, sG, Sg, sg
Punnet Square: **In the figure**
11. Smooth/Green = 9
Wrinklen Green = 3
Smooth/Yellow = 3
Wrinkled Yellow = 1
Hope this helps!
The codon loop.............