Question

Purple flowers are dominant over white flowers. A heterozygous purple flower is crossed with another heterozygous purple flower. The ratio of purple to white would be
Please help its really hard I really want to pass the EOC

Answer 1

You need to draw a punnet square:
   _______
__|P  | w   |
|P |PP| Pw|
|w |Pw| ww|

So that means you'll have:
1/4 PP flowers, which are homozygous purple flowers
2/4 Pw flowers, which are heterozygous purple flowers
1/4 ww flowers, which are homozygous white flowers

So the ratio of purple to white flowers is 3:1