Deviation from Mendelism

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Deviation from Mendelism: Overview

This topic covers concepts, such as Deviation from Mendelism, Polygenic Inheritance, and Pleiotropy.

Important Questions on Deviation from Mendelism

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The fundamental cause of the sickle-cell disease is a change in the structure of:

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

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

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Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) and aabbcc (light colour), in F 2 generation, what proportion of the progeny is likely to resemble either parent?

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The gene that controls many characters is called

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What will be number of gene pairs controlling a single character in polygenic inheritance if the phenotypic ratio obtained in F2 generation is 1 : 6 : 15 : 20 : 15 : 6 : 1?

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

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

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

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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:

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

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

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Skin colour is controlled by

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

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Who discovered polygenic inheritance?

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The additive or cumulative effect is shown by

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In pleiotropic inheritance, different traits are controlled by

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

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Example of a polygenic inheritance is-

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