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Principles Of Inheritance And Variation

Question
CBSEENBI12002180
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Match the terms in Column I with their description in Column II and choose the correct option. 


Column I Column II
A. Dominance   1. Many genes governs a single character
B. Codominance  2. In a heterozygous organism, only one allele expresses itself
C. Pleiotropy 3.  In a heterozygous organism both alleles express themselves fully
D. Polygenic inheritance 4. A single gene influences many characters
  • A B C D
    2 3 4 1
  • A B C D
    4 1 2 3
  •  A B  C  D 
     4 3   1 2 
  •  A B  C  D 
     2  1  4  3

Solution

A.

A B C D
2 3 4 1

Dominance is when only one gene expresses itself in the heterozygous condition.
Co-dominance is when both the genes express in the heterozygous condition.
Pleiotropy is when a single gene controls more than one phenotype. 
Polygenic inheritance is when a single trait is controlled by many genes

Some More Questions From Principles of Inheritance and Variation Chapter

Name one trait that does not blend.

Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

What for symbols AA and Aa stand ?

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 ?

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