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Principles of Inheritance and Variation

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

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


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. 

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. 


What for symbols AA and Aa stand ?

AA : Homozygous dominant, Aa : Heterozygous dominant.

Name the plant that shows incomplete dominance in respect of the colour of its flower.

The plany which shoes incomplete dominace in respect of the colour of its flower is -

Snapdragron ( Antirrhinum majus)

Or 

Mirabilis jalapa (Four-O- Clock plant ).

Name one trait that does not blend.

Sex trait .

Mention the phenomenon of pleiotropy by giving an example.

Pleiotropy. When one gene controls more than one phenotypic character it is termed as pleiotropy.

Example : Sickle cell anaemia.


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

(i) Lethality : Sickle cell anaemia.

(ii) Multiple allelism : ABO blood groups.