Read the passage below to answer the question:
Haemophilia is a disorder in which blood fails to clot. Saad, a male haemophiliac, marries Sara, a normal woman and together they have four children, two boys (Ahmed and Ali) and two girls (Alia and Ayesha). None of the children display the symptoms of Haemophilia.
Ahmed, Ali, Ayesha, and Ali all marry normal individuals and have children. None of Ahmed’s or Ali’s children, male or female, display symptoms of haemophilia, but the sons of Alia and Ayesha display symptoms of haemophilia while the daughters of Alia and Ayesha do not.
Which of the following best explains the reason that Ahmed, Ali, Ayesha and Alia do not display symptoms of haemophilia, even though their father, Saad, is a haemophiliac.
NTS 2010
Biology
Variation and Genetics
Elimination Tool:
2 responses to “Biology Practice MCQs Chapter 8 Class 12”
The answer to the question “The gene which controls ABO blood group has how many alleles in an individual” should be two because specifically in individual there are only two alleles for any gene
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