On one cactus species, the red flowers are dominant over white flowers. If you crossed two heterozygous cacti, what would be the probability of having offspring with red flowers?

3/4

Explanation:

This question involves a single gene coding for flower color in cactus plant. The allele for red flowers (R) are dominant over the allele for white flowers (r). This means that a cactus that is heterozygous (Rr) for the Gene will possess a red phenotype.

In this cross, two heterozygous cacti are crossed. The following gametes will be produced by each heterozygous parent: R and r. Using these gametes in a punnet square, the following genotype of offsprings will be produced;

RR, Rr, Rr, and rr

RR, Rr and Rr are Red flowers (3/4)

rr are white flowers (1/4)

Therefore, the probability of having offspring with red flowers is 3/4.

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