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1.1 Mendel's Laws, Test & Back Cross — Test 1
Q1. Mendel formulated his laws of inheritance using which organism?✓ Garden pea (Pisum sativum)
Q2. Gregor Johann Mendel, the father of genetics, was a/an:✓ Austrian monk
Q3. The term 'gene' was coined by:✓ Wilhelm Johannsen
Q4. The contrasting pairs of factors in Mendelian crosses are called:✓ Allelomorphs
Q5. The law of segregation is also known as the:✓ Law of purity of gametes
Q6. A back cross is a cross between an F1 and:✓ Either of the parental types
Q7. A test cross is the cross of an F1 hybrid to:✓ The recessive (homozygous recessive) parent
Q8. The best method to determine the homozygosity or heterozygosity of an individual is:✓ Test cross
Q9. Which one of the following is a test cross?✓ Aa Bb × aa bb
Q10. Which one of the following also represents a test cross?✓ Ww × ww
Q11. In pea, round (R) is dominant over wrinkled (r). A round-seeded plant arose from a wrinkled parent. Its genotype is:✓ Rr
Q12. A pure-breeding plant produces white flowers and continues to give only white flowers on selfing for many generations. This illustrates:✓ True breeding
Q13. The 1:2:1 ratio is the expected ratio of which class in the F2 of a monohybrid cross (one allele dominant)?✓ Genotypes
Q14. When a homozygous recessive is crossed with a heterozygote, the chance of homozygous-recessive-phenotype offspring is:✓ 50%
Q15. In a test cross of a pea plant heterozygous for the recessive 'wrinkled' allele, the fraction of wrinkled progeny is:✓ One half
Q16. The position of a gene on a chromosome is called its:✓ Locus
Q17. Alleles are best defined as:✓ Different forms of a gene at a given locus
Q18. Genes located at identical loci on homologous chromosomes are called:✓ Alleles
Q19. The appearance of an organism as dictated by its genotype (and environment) is called its:✓ Phenotype
Q20. Match each cross with the ratio it produces and select the correct option.✓ A-ii, B-iv, C-iii, D-i