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Principles Of Inheritance And Variation

Question
CBSEENBI12046953
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Which one of the following pairs of features is a good example of polygenic inheritance

  • Human height and skin colour

  • ABO blood group in humans and flower colour of Mirabilis jalapa

  • Hair pigment of mouse and tongue rolling in humans

  • Human eye colour and sickle cell anaemia

Solution

A.

Human height and skin colour

Polygenic inheritance is the inheritance pattern of a trail controlled by two or more genes. Genes may be on the same or different chromosomes and each gene may have two or more alleles. The gene expression is influenced by a variety of factors including gender, nutrition, breed, rate of growth, and amount of exercise. These traits are quantitative traits - that is, there is a wide range within the population. Such traits include height, weight, character, working abilities, and some genetic defects.

Some More Questions From Principles of Inheritance and Variation Chapter

Mention the phenomenon of pleiotropy by giving an example.

Name the plant that shows incomplete dominance in respect of the colour of its flower.

Write the genotypes of man with blood group A.

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio 

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

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