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Principles Of Inheritance And Variation

Question

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Identify ‘a’, ‘b’, ‘c’, ‘d’, ‘e’ and ‘f’ in the table given below :

No.

Syndrome

Cause

Characteristic of affected individuals

Sex

Male/Female/ both

1

Down’s

Trisomy of 21 chromosome

‘a’ (i)

(ii)

‘b’

2

‘c’

XXY

Overall masculine development

‘d’

3

Turner

45 with XO

‘e’ (i)

(ii)

‘f’

Solution

No.	Syndrome	Cause	Characteristic of affected individuals	Sex Male/Female/ both
1	Down’s	Trisomy of 21 chromosome	‘a’ (i) Furrowed tongue (ii) Partially open mouth, short stature	‘b’ - Both
2	'c' Klinefelter syndrome	XXY	Overall masculine development	‘d’ - Male
3	Turner	45 with XO	‘e’ (i) Sterile female with rudimentary ovaries (ii) Lack of secondary sexual characters	‘f’ - Female

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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