Rr x Rr What percentage of the offspring will be found? __________ What is the phenotypic ratio? What is the percentage of homozygous recessive offspring?
The cross Rr x Rr involves the mating of two heterozygous individuals. To determine the percentage of offspring that will be found, we need to consider the possible genotypes that can be generated from this cross.
The genotypes that can result from the cross Rr x Rr are RR, Rr, and rr. In this case, RR and rr represent homozygous dominant and homozygous recessive genotypes, respectively, while Rr represents the heterozygous genotype.
The phenotypic ratio represents the ratio of different phenotypes that can be observed in the offspring. In this case, the phenotypes are determined by the genotype of the offspring. Since the dominant allele (R) expresses itself while the recessive allele (r) is only expressed if both alleles in the genotype are recessive, the phenotypic ratio can be expressed as:
Dominant phenotype: Rr, RR (referred to as "R_")
Recessive phenotype: rr (referred to as "rr")
The phenotypic ratio is typically expressed as the ratio of dominant phenotype:recessive phenotype. In this case, since Rr and RR both represent the dominant phenotype, and rr represents the recessive phenotype, the phenotypic ratio would be:
R_: rr
To determine the percentage of homozygous recessive offspring, we need to first consider the possible genotypes of the offspring. There are a total of four possible genotypes (RR, Rr, Rr, and rr) that can be generated from this cross. Of these, only one genotype represents the homozygous recessive offspring, which is rr.
Therefore, the percentage of homozygous recessive offspring can be calculated by dividing the number of homozygous recessive offspring (1) by the total number of possible offspring (4), and then multiplying by 100:
Percentage of homozygous recessive offspring = (1/4) * 100 = 25%
In summary:
- The percentage of offspring that will be found is not provided in the question. Additional information is needed to determine this.
- The phenotypic ratio is R_: rr.
- The percentage of homozygous recessive offspring is 25%.