Questions: Question 15 1 pts The trait of medium-sized leaves in iris is determined by the genetic condition PP'. Plants with large leaves are PP, whereas plants with small leaves are P' P'. A cross is made between two plants each with medium-sized leaves resulting in 25% long, 50% medium, and 25% short-leaved progeny. What is the term for this allelic relationship? incomplete dominance positional effect codominance epistasis multiple alleles

Question 15
1 pts

The trait of medium-sized leaves in iris is determined by the genetic condition PP'. Plants with large leaves are PP, whereas plants with small leaves are P' P'. A cross is made between two plants each with medium-sized leaves resulting in 25% long, 50% medium, and 25% short-leaved progeny. What is the term for this allelic relationship?
incomplete dominance
positional effect
codominance
epistasis
multiple alleles

Transcript text: Question 15 1 pts The trait of medium-sized leaves in iris is determined by the genetic condition PP'. Plants with large leaves are PP, whereas plants with small leaves are $P^{\prime} P^{\prime}$. A cross is made between two plants each with medium-sized leaves resulting in $25 \%$ long, $50 \%$ medium, and $25 \%$ short-leaved progeny. What is the term for this allelic relationship? incomplete dominance positional effect codominance epistasis multiple alleles

Solution

The answer is the first one: incomplete dominance.

Explanation for each option:

Incomplete dominance: This is the correct term for the allelic relationship described in the question. In incomplete dominance, the heterozygous genotype (PP') results in a phenotype that is intermediate between the two homozygous phenotypes (PP and P'P'). In this case, medium-sized leaves are the result of the heterozygous condition, while large and small leaves are the result of the homozygous conditions.
Positional effect: This term refers to the influence of a gene's position on a chromosome on its expression, which is not relevant to the scenario described in the question.
Codominance: In codominance, both alleles in a heterozygous organism are fully expressed, resulting in a phenotype that shows both traits simultaneously. This is not the case here, as the medium-sized leaves are an intermediate phenotype, not a combination of large and small leaves.
Epistasis: This term describes a situation where the expression of one gene is affected by one or more other genes. The question does not describe any interaction between different genes, so epistasis is not applicable.
Multiple alleles: This term refers to the presence of more than two alleles for a genetic trait within a population. The question only involves two alleles (P and P'), so multiple alleles do not apply here.