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Principles Of Inheritance And Variation

Question
CBSEENBI12002690
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Which one of the following condition in humans is correctly matched with tis chromosomal abnormality /linkage?

  • Klinefelter's syndrom-44 autosomes + XXX

  • Colourblindness- Y-linked

  • Erythroblastosis foetails - X-linked

  • Down syndrome - 44 autosomes + XO

Solution

A.

Klinefelter's syndrom-44 autosomes + XXX

Klinefelter's syndrome si represented by 44 autosome+ XXY. When an abnormal egg with XX chromosome is fertilised by a sperm carrying Y-chromosome a zygote having XXY sex chromosomes is formed. The resulting young one is an abnormal sterile male. 

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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