(A) Thalassaemia is an autosomal recessive blood disorder. Let the normal allele be $T$ and the recessive allele for thalassaemia be $t$. Both parents

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(A) Thalassaemia is an autosomal recessive blood disorder. Let the normal allele be $T$ and the recessive allele for thalassaemia be $t$. Both parents are carriers,meaning their genotype is $Tt$. When crossing $Tt \times Tt$,the possible genotypes of the offspring are $TT$ (normal),$Tt$ (carrier),$Tt$ (carrier),and $tt$ (affected). The probability of an affected child $(tt)$ is $1/4$ or $0.25$.

Class 12 Biology Principles of Inheritance and Variation Pedigree Analysis and Mendelian disorders

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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?

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A
$0.25$
B
$1$
C
No chance
D
$0.5$

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Principles of Inheritance and Variation

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Pedigree Analysis and Mendelian disorders

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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?

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Pedigree analysis is very important in human beings because

$A$ person is suffering from the disease phenylketonuria, which is an autosomal recessive disease. Which of these is lacking in the person?

$A$ husband and wife both have normal vision,although both of their fathers were colorblind. What is the probability that their daughter will be colorblind (in $\%$)?

In sickle-cell anaemia,which of the following amino acids is substituted?

The harmful allele of sickle cell anemia has not been eliminated from the human population. Such afflicted people derive some other benefit. Discuss.

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