Question

An organism has the genotype Rr and the phenotype R. This is known as the concept of:

1) Incomplete dominance
2) Codominance
3) Dominant phenotype
4) Recessive phenotype

Answer 1

An organism with the genotype Rr showing the phenotype for R has a dominant phenotype because the R allele masks the expression of the r allele in the heterozygous state.

Step-by-step explanation:

An organism with genotype Rr displaying the phenotype R has a dominant phenotype. This occurs in cases of Mendelian inheritance where one allele is expressed over the other, which is referred to as dominant and the other as recessive. The dominant allele (R) masks the expression of the recessive allele (r) in the heterozygous state (Rr), resulting in the dominant phenotype.

In incomplete dominance, the heterozygote exhibits an intermediate phenotype, which is different from the concept described. Codominance is when both alleles in the heterozygote are simultaneously expressed. However, if only the dominant allele is expressed in the phenotype, then it is simply called dominance. The organism's phenotype represents the physical expression of the genotype due to the expressed alleles.