Question

In tomato's, red fruit (R) is dominant over yellow fruit (r). What is the probability that an offspring of plants that are heterozygous (Rr) produce plants with the homozygous recessive (rr) genotype?

Answer 1

Answer:

1 out of 4

or

25%

Explanation:

First we draw a Punnett Square for this:

          R      r

   R    RR    Rr

   r     Rr     rr

So here we have the following genotypes possible for this cross:

RR = homozygous dominant

Rr = heterozygous dominant

rr = homozygous recessive

As you can see out of the four (4) possible outcomes, one (1) of them is rr. So the probability is 1 out of 4 chances or 25%.