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Principles Of Inheritance And Variation

Question
CBSEENBI12047591
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Barr-body in mammals represents

  • one of the two X-chromosomes in the cells

  • all heterochromatin of male and female cells

  • Y-chromosome of male

  • all heterochromatin of female cells

Solution

A.

one of the two X-chromosomes in the cells

Barr-body in mammals represent one of the two X-chromosomes in cells of female. It represents the facultative heterochromatin of inactivated X-chromosome.

Some More Questions From Principles of Inheritance and Variation Chapter

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 ?

What is the unique feature of F1 generation ?

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