MCQs Plant Breeding and Genetics-50 Posted on 2025-11-16Author admin 0 1. The key event distinguishing meiosis I from mitosis is ———— Chromosome condensation Cytokinesis DNA replication Synapsis and crossing over 2. The total number of possible gamete combinations from independent assortment in an organism with 3 pairs of chromosomes is ———– 12 6 8 3 3. Sister chromatids separate during ————- Anaphase II Metaphase I Anaphase I Prophase II 4. Segregation of alleles occurs because —— Homologous chromosomes separate Sister chromatids separate Crossing over occurs DNA replicates 5. The law of independent assortment results from ———– Random orientation of homologous chromosomes at metaphase I Random fusion of gametes Mutation Crossing over 6. Crossing over is a genetic process, where exchange of genetic material occurs between ———– Homologous centromeres Non-sister chromatids of homologous chromosomes Sister chromatids of the same chromosome Telomeres only 7. Synaptonemal complex, which forms between homologous chromosomes during prophase I of meiosis, is mainly composed of ———- Lipids Proteins RNA DNA 8. Which phase of mitosis is most similar to meiosis II? Telophase Prophase Anaphase Metaphase 9. Mustard gas was first identified as a chemical mutagen in experiments on __________. E. coli Arabidopsis thaliana Drosophila melanogaster Neurospora crassa 10. Homologous chromosomes move to opposite poles during ———– Metaphase I Telophase I Anaphase II Anaphase I Loading …