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Principles Of Inheritance And Variation

Question
CBSEENBI12002434
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An abnormal human baby with 'XXX' sex chromosomes was born due to

  • formation of abnormal sperms in the father

  • formation of abnormal ova in the mother

  • fusion of two ova and one sperm

  • fusion of two sperms and one ovum

Solution

B.

formation of abnormal ova in the mother

Formation of an abnormal ova usually occurs as an event during the formation of reproductive cells. 
An error in cell division called non-disjunction can result in reproductive cells with additional chromosomes. Any of these cells if contributes in the genetic make up of child leads to trisomy of X-chromosome i.e. the child will have an extra X-chromosome. ZZ+ XX in mother will lead to birth of XXX genotype baby.

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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