Biology 425: True-False Questions- Chapters 8-25, Complete With Answers.

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1. Sexual Reproduction; p. 141; easy; ans: F All eukaryotes ( do not) reproduce sexually. 2. Sexual Reproduction; p. 142; easy; ans: T Homologous chromosomes resemble each other in size, shape, and... the kinds of hereditary information they contain. 3. The Eukaryotic Chromosome; p. 143; moderate; ans: F A nucleosome is composed of histone proteins wrapped (twice) around a DNA filament. 4. The Process of Meiosis; pp. 143-144; easy; ans: T In contrast to a gamete, a spore can develop into an organism without uniting with another cell. 5. The Process of Meiosis; p. 145; moderate; ans: F Crossing-over is the exchange of genetic material between the sister (homologous) chromatids of a chromosome. 6. The Process of Meiosis; p. 145; moderate; ans: T Chiasmata are the visible representation that crossing-over has taken place. 7. The Process of Meiosis; p. 147; moderate; ans: F It is (impossible) likely that one of the four daughter cells resulting from meiosis will be genetically identical to one of the gametes that fused to produce the diploid line of cells undergoing meiosis. 8. How Characteristics Are Inherited; p. 150; moderate; ans: F The term “genotype” (phenotype) refers to the appearance of an individual. 9. How Characteristics Are Inherited; p. 151; moderate; ans: T A testcross is used to determine whether a plant showing a dominant trait is homozygous or heterozygous for that trait. 10. The Principle of Independent Assortment; pp. 151–152; moderate; ans: T Mendel’s experiments using dihybrid crosses produced completely new combinations of characteristics in the F1 generation. 11. Linkage; p. 152; easy; ans: F The greater the distance between two genes on a chromosome, the smaller (greater) is the chance that they will undergo crossing-over during meiosis. 12. Mutations; p. 153; easy; ans: T A mutation is any change in the hereditary state of an organism. 13. Mutations; p. 154; easy; ans: T Polyploidy results from the duplication of whole sets of chromosomes. 14. Mutations; p. 155; moderate; ans: T A mutation in a haploid cell is more likely to have an effect on phenotype than a mutation in a diploid cell. 15. Broadening the Concept of the Gene; p. 156; moderate; ans: F Epistasis (Polygenic inheritance) is an example of interactions between the alleles of a gene. 16. Broadening the Concept of the Gene; p. 157; moderate; ans: T Cytoplasmic inheritance refers to genes located in mitochondria or plastids [Show More]

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