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Principles Of Inheritance And Variation

Question
CBSEENBI12002396
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Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?

  • Phenylketonuria

  • Sickle cell anaemia

  • Haemophilia

  • Thalassemia

Solution

C.

Haemophilia

Colourblindness and haemophilia are two main sex-linked or X-linked recessive diseases. The gene of haemophilia goes to son from mother and to daughter from father. In this disease, the blood is fail to clot when exposed to air result in continuous bleeding and leads to death. 

Some More Questions From Principles of Inheritance and Variation Chapter

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Write down Mendel’s dihybrid Phenotypic ratio 

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What are the real determinants of what an organism will become ?

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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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