If R is dominant to r, the offspring of the cross of RR with rr will ____.
A) have a unique phenotype
B) have the same phenotype as the RR parents
C) have the same phenotype as the rr parents
D) have the same genotype as the RR parents
E) have the same genotype as the rr parents

Question

If R is dominant to r, the offspring of the cross of RR with rr will ____.​
A) ​have a unique phenotype
B) ​have the same phenotype as the RR parents
C) ​have the same phenotype as the rr parents
D) ​have the same genotype as the RR parents
E) ​have the same genotype as the rr parents

Quizplus · Accepted Answer

Since R is dominant to r, the offspring from a cross between RR (homozygous dominant) and rr (homozygous recessive) will all inherit one R allele and one r allele, making them heterozygous (Rr). However, because R is dominant, the phenotype will be determined by the R allele, resulting in the offspring having the same phenotype as the RR parents.

If R Is Dominant to R, the Offspring of the Cross