Question

Which one of the following represents a deviation from Mendelian concepts?
A.Segregation
B.Independent assessment
C.Purity of gametes
D.Incomplete dominance

Answer 1

Mendelian concepts revolve around the laws of inheritance proposed by Gregor Mendel, which are the law of dominance, the law of independent assortment, and the law of segregation. But some evidence such as incomplete dominance goes against mendelian concepts

Complete answer: Mendel’s proposed laws each state a fact of inheritance, where the law of dominance states that the dominant allele will mask the recessive allele and only the dominant allele would be featured. The law of independent assortment states that each allele during the recombination process assorts itself independent of the other allele. And the law of segregation states that the offspring will possess one allele from both the parents.
All of Mendel's studies were performed using the pea plant. But other rare species of plant defy certain laws proposed by Mendel, mainly the law of dominance.
For example, some flowers which have a dominant color and a recessive color, are capable of producing flowers in a color that is a mixture of both colors. Here the dominant allele does not assert complete dominance and thus is termed as incomplete dominance.

Another phenomenon is where a plant of two different colored flowers is capable of producing flowers with both colors present. As both the dominant allele and recessive allele are capable of asserting equal dominance, it's known as codominance.
Thus, the correct option is D, incomplete dominance.

Note: Incomplete dominance is when both the dominant allele and recessive allele assert partial dominance or incomplete dominance resulting in a mixed trait.
Codominance is where both the dominant allele and the recessive allele is capable of asserting equal and complete dominance.
Independent assessment is also known as the independent assortment which is a mendelian law
The law of segregation is also known as the law of purity of gametes and thus is also a mendelian law.