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Principles Of Inheritance And Variation

Question
CBSEENBI12003204
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A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by

  • Down syndrome

  • triploidy

  • Turner syndrome

  • super femaleness

Solution

A.

Down syndrome

Down syndrome is caused by the trisomy on 21st chromosome. In this, fusion of normal n gamete (haploid) takes place with n + 1 gamete (diploid). It was first described by J. Langdon Down in 1866.

Common symptoms include short height, stocky build, short hands, flattened facial features and poor muscle tone and are mentally retarded.

Some More Questions From Principles of Inheritance and Variation Chapter

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 ?

Define heterogamy. Give an example.

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