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Principles Of Inheritance And Variation

Question
CBSEENBI12046956
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Given below is a highly simplified representation of the human sex chromosomes from a karyotype

  • The gene a and b could be of colour blindness and body height

  • attached ear lobe and Rhesus blood group

  • haemophilia and red-green colour blindness

  • phenylketonuria and haemophilia

Solution

C.

haemophilia and red-green colour blindness

The figure shows, human sex chromosome with genes 'a'and b. So, 'a' and b' are sexlinked genes, that arc inherited through sex chromosomes. The most important character of sex linked inheritance are colourblindness and haemophilia. Both the disorders are due to recessive sex linked genes. The gene for red green colour blindness is located on X chromosomes. The person suffering from this disease is unable to distinguish red and green colours. Haemophilia, also called bleeder's disease, is due to presence of recessive gene on X-chromosome. The person suffering from this disease have blood which does not clot properly i.e, lacking a factor (plasma thromboplastin) which is responsible for clotting of blood.

Some More Questions From Principles of Inheritance and Variation Chapter

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.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

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