Question

In roses, the color red is dominant (R), and the color white is recessive (r). Based on the Punnett Square, what is the probability ratio that the roses will be white?

Answer 1

Answer:

0.25

Explanation:

From the given information:

The dominant trait R = red color; &

The recessive trait r = white

If a heterozygous traits Rr  crosses with a dominant trait RR;

The Punnet square will be as follows:

              R               r

R            RR             Rr

R            RR             Rr

Thus all the flowers are red and there is 50% dominant red rose flowers (RR) and 50% heterozygous red rose flowers (Rr).

Let assume that two heterozygous traits (Rr) cross together; Then the punnet square is:

          R         r

R        RR        Rr

r          Rr        rr

From the above punet square, we have:

0.25 dominant red rose flowers

0.5 heterozygous red rose flowers;

0.25 recessive white rose flowers.