Deviation from Mendelism
Deviation from Mendelism: Overview
This topic covers concepts, such as Deviation from Mendelism, Polygenic Inheritance, and Pleiotropy.
Important Questions on Deviation from Mendelism
The fundamental cause of the sickle-cell disease is a change in the structure of:

When one gene controls two or more different characters simultaneously, the phenomenon is called

Which one of the following pairs of features is an excellent example of polygenic inheritance?

Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) and aabbcc (light colour), in generation, what proportion of the progeny is likely to resemble either parent?

The gene that controls many characters is called

What will be number of gene pairs controlling a single character in polygenic inheritance if the phenotypic ratio obtained in generation is

Identify the incorrect statement with reference to hybridisation experiment in lentil.

Which one of the following is not caused by pleiotropic alleles?

If one gene influences many phenotypic traits, the phenomenon is called

Choose the wrong statement
(A) A single gene product may produce more than one effect thus it relates to pleiotropy.
(B) Dominance is an autonomous feature of a gene or the product.
(C) The frequency of recombination between gene pairs on the same chromosome as a measure of distance between those genes.
(D) Breeder cannot select the mutations of the desirable types as it has less variability.
The correct answer is:

If single gene can exhibit multiple phenotypic effect then such gene is called :-

When two genes control a single character and have cumulative effect, the ratio is

Skin colour is controlled by

Who studied the inheritance of skin colour in negro and white population in USA?

Who discovered polygenic inheritance?

The additive or cumulative effect is shown by

In pleiotropic inheritance, different traits are controlled by

Interaction between the alleles of different genes on the same or different chromosome is called

Example of a polygenic inheritance is-

In which of the following categories does the genetic disorder phenylketonuria fall into?
