Kip studies flower color in petunias, where the allele for red flowers, r, is dominant to the allele for white flowers, r. if kip makes the cross rr x rr, the gametes that are produced
a)will all carry the r allele.
b)will all carry the r allele.
c)by one parent will carry r and by the other parent will carry r.
d)by one parent will carry rr and by the other parent will carry rr.

The answer is C: Gametes from one parent will carry R and by the other parent will carry r.

Explanation:

Gametes are produced from the parent cell by meiosis and are haploid in nature. The genotype of parents which are allowed to cross is as follows:

Parent (2n) : RR   x   rr

Gametes (n) : R (from one parent) and r from another parent

F1 generation (2n): Rr (plants with red flower will be obtained since R is dominant even a single copy is sufficient for its expression)