Question

In a genetic cross between two flowering plants that are heterozygous for the color trait, red flowers (R) are dominant to white flowers (r). What fraction of the offspring should have red flowers?
Three–fourths of the offspring should have red flowers.
One–half of the offspring should have red flowers.
One–fourth of the offspring should have red flowers.

Answer 1

Red flowers if homozygous dominant genes are prsent like RR and multiply with recesive gene which is ( rr) Rr × rr = (Rr Rr rr rr )half r red and half r white. If red flowers are homozygous dominant genes like RR × rr = (Rr Rr Rr Rr )all are red flowers