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Principles Of Inheritance And Variation

Question

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A colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.

Solution

Colour blindness is a sex-linked disease. The gene for this disorder is present on the X chromosome. If a colour-blind child is born to a normal couple, then the mother would be a carrier of the disease. The child would be male. The following cross shows the inheritance of the disorder:

Some More Questions From Principles of Inheritance and Variation Chapter

Name one trait that does not blend.

Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

What for symbols AA and Aa stand ?

Mention the phenomenon of pleiotropy by giving an example.

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 ?

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