Rr x Rr
1. What percentage of the offspring will be round?
2. What is the phenotypic ratio?
3. What is the percentage of homozygous recessive offspring?
1. The percentage of the offspring that will be round can be determined using the Punnett square method. When crossing an Rr individual with another Rr individual, there are four possible combinations: RR, Rr, Rr, and rr. In this case, both the capital R allele and the lowercase r allele are responsible for the round trait. Since both the capital and lowercase allele are present, the percentage of round offspring will be 75%.
2. The phenotypic ratio is the ratio of the observable traits in the offspring. In this case, the phenotypic ratio is 3:1, with 3 offspring being round and 1 offspring being wrinkled.
3. The percentage of homozygous recessive offspring can be determined by looking at the genotypes in the Punnett square. In this case, there is 1 possibility for a homozygous recessive offspring, which is rr. Therefore, the percentage of homozygous recessive offspring is 25%.
Rr x rr
1. What percentage of the offspring will be round?
2. What is the genotypic ratio?
3. What is the percentage of heterozygous offspring?
1. When crossing an Rr individual (heterozygous) with an rr individual (homozygous recessive), there are two possible combinations: Rr and rr. In this case, only the capital R allele is responsible for the round trait, while the lowercase r allele is responsible for the wrinkled trait. Therefore, the percentage of round offspring will be 50%.
2. The genotypic ratio is the ratio of the different genotypes in the offspring. In this case, the genotypic ratio is 1:1, with 1 offspring having the genotype Rr and 1 offspring having the genotype rr.
3. The percentage of heterozygous offspring can be determined by looking at the genotypes in the Punnett square. In this case, there is 1 possibility for a heterozygous offspring, which is Rr. Therefore, the percentage of heterozygous offspring is 50%.