Character traced in this pedigree is nbsp-X linked recessive- color blindnessX linked dominant - incontinentia pigmentAutosomal dominant - Alzhemer-s diseasesAutosomal recessive - alkaptonuria

The correct option is A X linked recessive color blindnessIf the disorder #10;is recessive, neither #160;parent has to have the disorder #10;because they ...

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Standard XII

Biology

Definition of Sex-Linked Inheritance

Character tra...

Question

Character traced in this pedigree is

X linked recessive- color blindness

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X linked dominant - incontinentia pigment

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Autosomal dominant - Alzhemer's diseases

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Autosomal recessive - alkaptonuria

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Solution

The correct option is A X linked recessive- color blindness
If the disorder is recessive, neither parent has to have the disorder because they can be heterozygous. More males than females are affected:- Affected sons are usually born to unaffected mothers, thus the trait skips generations. Approximately 1/2 of carrier mothers’ sons are affected. It is never passed from father to son. All daughters of affected fathers are carriers.

So, the correct option is 'X linked recessive- color blindness'.

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This pedigree shows the inheritance of colour blindness or sex-linked trait. Is this trait dominant or recessive? Is the mother of the colourblind girl in the F3 generation colourblind, a carrier or a person with normal colour vision? Explain. [4 MARKS]

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Q. Pick out the correct statements.
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II. Down’s syndrome is due to aneuploidy.
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IV. Sex complement of a Klinefelter’s syndrome is XXY.
V. Sickle cell anaemia is an X-linked recessive gene disorder.

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