If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are ch

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4.Principles of Inheritance and Variation

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If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

$0.25$

$1$

No chance

$0.5$

(NEET-2013)

Solution

(a): Thalassaemia is an autosomal recessiveblood disorder. In the given case, both the partners are unaffected carriers for the gene $i.e.$, have heterozygous genotype $Tt$. Persons homozygous for the autosomal recessive gene of $\beta$-thalassaemia suffer from severe haemolytic anaemia. Heterozygous persons are also not normal, but show the defect in a less severe form (thalassaemia minor).

Standard 12

Biology

Which of these is not a Mendelian disorder?

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Genes for colour blindness is carried by

$I.$ Abnormal development

$II.$ Father

$III.$ Mother

$IV.$ Autosomes

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A husband and wife have normal vision but fathers of both of them were colour blind. Probability of their first daughter to be colour blind is

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(AIPMT-1990)

Given is : $X$ is the chromosome with gene for haemophilia and $X$ is the chromosome with normal gene. Which of the following individuals will act as carrier for haemophilia

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A man known to be victim of haemophilia marries a normal woman whose father was known to be a bleeder. Then it is expected that

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(AIIMS-1985)

If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

Solution

Similar Questions

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Genes for colour blindness is carried by

$I.$ Abnormal development

$II.$ Father

$III.$ Mother

$IV.$ Autosomes