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Principles Of Inheritance And Variation

Question
CBSEENBI12047151
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A person with the sex chromosomes XXY suffers from :

  • Down's syndrome

  • Turner's syndrome

  • Gynandromorphism

  • Klinefelter's syndrome

Solution

D.

Klinefelter's syndrome

Klinefelter's syndrome is a chromosomal abnormality due to which an individual has two X-chromosomes and one Y-chromosome ie, XXY. Such persons are sterile male and may exhibit secondary female characters.

Down syndrome is also known as Trisomy- 21. It is a genetic disorder caused by the presence of extra copy of chromosome on 21st chromosome.

Turner's syndrome is a chromosomal condition that affects development in females. It consists of only 45 pairs of chromosomes ie, it is represented as X0. Females with this type of disease have short stature.

A gynandromorph can have bilateral asymmetry; one side female and one side male. Alternatively, the distribution of male and female tissue can be more haphazard. Bilateral gynandromorphy arises very early in development, typically when the organism has between 8 and 64 cells.

Some More Questions From Principles of Inheritance and Variation Chapter

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 ?

What is the unique feature of F1 generation ?

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