Q1. Which term describes an organism with identical alleles for a given trait?A. HeterozygousB. HomozygousC. DiploidD. Hybrid
Q2. Which chromosomal abnormality causes Edward’s syndrome?A. Monosomy of X chromosomeB. Trisomy of chromosome 18C. Trisomy of chromosome 21D. Deletion of chromosome 5
Q3. Which phenomenon explains why linked genes do not follow Mendel’s law of independent assortment?A. MutationB. LinkageC. PleiotropyD. Epistasis
Q4. Which of the following disorders is caused by a defect in clotting factors?A. Sickle-cell anemiaB. HemophiliaC. ThalassemiaD. Phenylketonuria
Q5. Which of the following disorders is caused by a mutation in the gene coding for the enzyme phenylalanine hydroxylase?A. Sickle-cell anemiaB. ThalassemiaC. PhenylketonuriaD. Cystic fibrosis
Q6. Which type of mutation involves a change in a single nucleotide without shifting the reading frame?A. Point mutationB. Frameshift mutationC. Deletion mutationD. Nondisjunction
Q7. Which type of mutation occurs due to the deletion or insertion of a single nucleotide in a gene sequence?A. Point mutationB. Frameshift mutationC. Silent mutationD. Missense mutation
Q8. Which of the following disorders is inherited as an autosomal recessive trait?A. HemophiliaB. ThalassemiaC. Klinefelter’s syndromeD. Turner’s syndrome
Q10. Which of the following statements about independent assortment is incorrect?A. Independent assortment occurs during meiosis.B. It applies to genes located on different chromosomes.C. Linked genes follow independent assortment.D. It contributes to genetic variation.