1)Sickle cell is more prevalent in tropical countries than in temperate countries.Give an explanation
2)State the function of Decoy ribonucleic acid(DNA)molecule
3)What is meant by the term allele
4)Name one defect of nondisjunction chromosomal mutation
5)Name two disorders in humans caused by gene mutations
6)What is the advantage of having blood group AB
7)Define the term sex linkage
8)Name two sex linked traits in man
9)Give a characteristic in humans beings that is controlled by multiple alleles
1) Sickle cell is more prevalent in tropical countries than in temperate countries because the sickle cell trait offers some protection against malaria, which is more prevalent in tropical regions.
2) The function of Decoy ribonucleic acid (DNA) molecule is to bind to specific proteins, preventing them from binding to their target molecules.
3) An allele is a variant form of a gene, which can result in different traits or characteristics.
4) One defect of nondisjunction chromosomal mutation is Down syndrome, which is caused by an extra copy of chromosome 21.
5) Two disorders in humans caused by gene mutations are cystic fibrosis and Huntington's disease.
6) The advantage of having blood group AB is that individuals with this blood type can receive blood from donors with blood types A, B, AB, or O.
7) Sex linkage refers to the inheritance of a gene located on a sex chromosome, most commonly the X chromosome in humans.
8) Two sex linked traits in man are color blindness and hemophilia.
9) One characteristic in human beings that is controlled by multiple alleles is blood type, which is determined by the presence of A, B, and O alleles.