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Principles Of Inheritance And Variation

Question
CBSEENBI12047407
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Persons suffering from sickle-cell anaemia normally do not suffer from

  • cholera

  • malaria

  • high blood pressure

  • hepatitis

Solution

B.

malaria

Sickle-cell anaemia is a blood disease in which blood cells reveal an abnormal crescent (sickle) shape due to the point mutation at 6th position of β-haemoglobin chain (glutamic acid → valine). The resulted sickle-shape RBCs are resistant to attack by Plasmodium the vector of malarial disease.

Some More Questions From Principles of Inheritance and Variation Chapter

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 ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

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