Question

In radishes, the gene that controls color exhibits incomplete dominance. Pure-breeding red radishes (RR) crossed with pure-breeding white radishes (WW) make purple radishes. What are the genotypic and phenotypic ratios when you cross a purple radish with a white radish?

Answer 1

Crossing a purple radish (RW) with a white radish (WW) in a scenario of incomplete dominance results in genotypic and phenotypic ratios of 1:1 for RW (purple) and WW (white) offspring.

Step-by-step explanation:

In cases of incomplete dominance such as in radishes, a cross between a purple radish (RW) and a white radish (WW) will result in offspring with one of two possible genotypes: RW or WW. Because the purple radish has one red allele (R) and one white allele (W), and the white radish has two white alleles (WW), a Punnett square can help illustrate the possible genotypic outcomes.

By crossing RW (purple) with WW (white), the Punnett square would have these possible combinations: RW and WW. Hence, the genotypic ratio is 1:1 for RW to WW. The phenotypic ratio would also be 1:1 because purple radishes (RW) would appear in half of the progeny, while the other half would be white (WW).

Therefore, a cross between a purple radish and a white radish results in a 50% chance of producing purple radishes and a 50% chance of producing white radishes.

Answer 2

Genotype ratio= 1 RW: 1 WW

Phenotype ratio= 1 purple: 1 white

Step-by-step explanation:

According to the given information, the gene for the color of radishes exhibits incomplete dominance and the heterozygous genotype gives purple color to the radishes. The genotype of the heterozygous parent plant with purple radishes would be "RW". A cross between a purple radish (RW) and a white radish (WW) would give progeny in following ratio=

Genotype ratio= 1 RW: 1 WW

Phenotype ratio= 1 purple: 1 white