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Fused ear lobes appear in the progeny due to an autosomal recessive gene. Work out the genotypes of members in the given pedigree.

(a)
(b)
(c)
(d)

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Important Questions on Principles of Inheritance and Variation
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In the following pedigree chart, the mutant trait is shaded black. The gene responsible for the trait is


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The possibility of a female becoming haemophilic is extremely rare because the mother of such a female has to be at least (i) and father should be (ii).

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Result of a cross between a normal homozygous female and a haemophilic male would be

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A colourblind man marries a woman who is carrier for haemophilia Which of the following is true for their progenies?

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A marriage between a colourblind man and a normal woman produces

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Red green colourblindness is a sex linked trait. Which of the given statements is not correct regarding colourblindness?

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Refer to the given figure.
The shape of under oxygen tension in the given situation becomes

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An individual affected by phenylketonuria lacks an enzyme that converts the amino acid_______ into _____.
