Experiments on Plant Hybridization by Gregor Mendel - Exam
- 1. In the mid-19th century, Gregor Mendel, an Austrian monk and botanist, conducted groundbreaking experiments on plant hybridization that would lay the foundation for the field of genetics. By carefully breeding pea plants (Pisum sativum), Mendel meticulously observed the inheritance of traits such as color, shape, and size across generations. His pioneering work involved cross-pollinating the plants and documenting the ratios of the traits in the offspring, which revealed the distinct patterns of dominance and recessiveness. Through these experiments, Mendel formulated his famous laws of inheritance, including the Law of Segregation and the Law of Independent Assortment. These laws demonstrated that traits are inherited as discrete units, later known as genes, and that the inheritance of one trait does not influence the inheritance of another. Although his work went largely unrecognized during his lifetime, it eventually provided crucial insights into genetic inheritance, influencing the fields of biology, agriculture, and medicine, and earning Mendel the title of the father of modern genetics.
What is the primary focus of Gregor Mendel's experiments?
A) Plant hybridization
B) Human genetics
C) Animal behavior
D) Soil composition
- 2. What term describes the different forms of a gene?
A) Alleles
B) Genomes
C) Chromosomes
D) Loci
- 3. What is the outcome of a monohybrid cross?
A) Multiple traits
B) One trait
C) Two traits
D) No traits
- 4. What was Mendel's conclusion about dominant and recessive traits?
A) Recessive traits are always expressed
B) Dominant traits do not exist
C) All traits are equally dominant
D) Dominant traits mask recessive traits
- 5. In a genotype, what does the term 'homozygous' mean?
A) Variable alleles
B) Different alleles
C) Identical alleles
D) Single allele
- 6. What generation is produced by crossing two purebred parents in Mendel's experiments?
A) F2 generation
B) P generation
C) F3 generation
D) F1 generation
- 7. What is the law that states alleles separate during gamete formation?
A) Law of Independent Assortment
B) Law of Dominance
C) Law of Segregation
D) Law of Genetics
- 8. Mendel published his work in which of the following?
A) The Journal of Genetics
B) The Proceedings of the Natural History Society
C) Nature
D) Science
- 9. What are the possible genotypes for a plant exhibiting a dominant trait?
A) Only homozygous recessive
B) Only heterozygous
C) Homozygous dominant or heterozygous
D) Homozygous recessive
- 10. In genetic notation, what does 'Aa' represent?
A) Heterozygous genotype
B) Homozygous recessive
C) Phenotypically recessive
D) Homozygous dominant
- 11. What is the term for the observable traits of an organism?
A) Allele
B) Genotype
C) Chromosome
D) Phenotype
- 12. Mendel's work laid the foundation for which scientific field?
A) Botany
B) Ecology
C) Evolution
D) Genetics
- 13. In which year did Mendel publish his work on hybridization?
A) 1889
B) 1866
C) 1870
D) 1856
- 14. Mendel's experiments suggested that traits are inherited independently. What is this principle called?
A) Dominance
B) Hybridization
C) Segregation
D) Independent assortment
- 15. What form of inheritance shows both traits equally in the phenotype?
A) Recessive dominance
B) Polygenic inheritance
C) Codominance
D) Incomple dominance
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