28. Haemophilia (type A) is an X-linked recessive disease. Mary and her husband are both unaffected; however, their first son has haemophilia. What is the possibility of being affected by haemophilia for their next children?(A)50%(B)25%(C)6.25%(D)12.5%

9. Your Biology teacher gives you two human cell lines, A and B, which are in G₀ and G₁ phases of the cell cycle, respectively. Which of the following cellular event is true if these two cell lines are stimulated with growth factors to pass the restriction point?(A)Only the G₀ cell will replicate its DNA;(B)Only the G₁ cell will replicate its DNA;(C)Both cells will replicate their DNA;(D)Neither of the cells will replicate their DNA.

28. Haemophilia (type A) is an X-linked recessive disease. Mary and her husband are both unaffected; however, their first son has haemophilia. What is the possibility of being affected by haemophilia for their next children?
(A)50%
(B)25%
(C)6.25%
(D)12.5%

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