Question

the inheritance pattern for radish shape exhibits incomplete dominance. a radish that is homozygous for the crossed with a radish that is homozygous for the long allele.

what is the phenotypic outcome of the offspring that result from this cross?
○ some offspring have round radishes; some have long radishes.
○ all offspring have round radishes.
○ all offspring have oval radishes.
○ all offspring have irregularly shaped radishes.

Explanation:

In incomplete dominance, the heterozygous phenotype is an intermediate between the two homozygous phenotypes. Let's assume the allele for round shape is \(R\) and for long shape is \(r\). A homozygous round radish has genotype \(RR\) and a homozygous long radish has genotype \(rr\). When \(RR\times rr\), all offspring have genotype \(Rr\). Since it is incomplete dominance, the \(Rr\) genotype gives the oval (intermediate) phenotype.

Answer:

All offspring have oval radishes.