4.Principles of Inheritance and Variation
medium

જો બંને પિતૃઓ થેલેસેમીયાના વાહક હોય જે દૈહિક રંગસૂત્રીય પ્રચ્છન્ન ખામી છે. ગર્ભાધાનને કારણે અસરકારક બાળક હોવાની સંભાવના કેટલી?

A

$0.25$

B

$1$

C

કોઈ સંભાવના નહીં

D

$0.5$

(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

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