(a) Why is it that the father never passes on the gene for haemophilia to his sons? Explain. (b) State the functions of the following in a prokaryote : (i) tRNA, (ii) rRNA

(a) Why is it that the father never passes on the gene for haemophilia

1.	(a) Why is it that the father never passes on the gene for haemophilia to his sons? Explain. (b) State the functions of the following in a prokaryote : (i) tRNA, (ii) rRNA
Answer» (a)Haemophilia and colour blindness are x-chromosome linked recessive disorder. Males have only one copy of x-chromosome and one y-chromosome. The genes on these chromommee do not have corresponding alleles. Therefore, the presence of only single defective x-chromoeome will result in these disorders. Women can develop these disorders only when they have both the defective copies of x-chromosomes, which is rare. Since, the father passes on only the ychromosome to the son a son is not haemophiliac. (b) (i) (a) tRNA-It acts as an adaptor molecule that picks up a particular amino acid from cellular pool and takes the same over to A site of mRNA for incorporation in the polypeptide chain. (b) It recognises the codon on mRNA by its anticodon. (ii) (a) rRNA-It constitutes the ribosomal structure. (b) It helps to form peptide bond.

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(a) Why is it that the father never passes on the gene for haemophilia to his sons? Explain. (b) State the functions of the following in a prokaryote : (i) tRNA, (ii) rRNA

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