Question

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?

Answer 1

3/4

Step-by-step 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.