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UNIVERSAL EDUCATION ICSE GRADE X SUBJECT: BIOLOGY _____________________________________________________________________________ Genetics SECTION A TYPE QUESTIONS 1. Name the following. 1. The physical expression of gene in an individual. Phenotype 2. Father of genetics Gregor Johann Mendel 3. The branch of science which deals with the heredity. Genetics 4. The chromosome responsible for sex determination Sex chromosome 5. A hereditary disease in which blood does not clot. Haemophilia 6. The unit of heredity. Genes 7. Number of pairs of autosomes in humans. 22 pairs 8. The condition in which both the alleles are identical. Homozygous 9. The chemical substance which constitutes genes. DNA 10. The sex chromosome of male. X and Y 11. The allele which expresses itself on the other. Dominant 12. One genetic disease. Haemophilia 13. The genetic makeup of an organism. Genotype 14. A cross between one pair of contrasting characters. Monohybrid cross 15. Two sex linked inherited disease. Haemophilia and color blindness 16. The organism on which Mendel had worked. Pisum sativum 17. The condition in which both the alleles are identical. Homozygous
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