Download Chapter 6 Homework Questions- Meiosis and Genetics Section 6.1

Chapter 6 Homework Questions- Meiosis and Genetics
Section 6.1 – Chromosomes and Meiosis
1. Are homologous chromosomes identical to each other? Explain.
2. Why is it important that gametes are haploid cells?
3. Does mitosis or meiosis occur more frequently in your body? Explain your answer.
4. Do you think the Y chromosome contains genes that are critical for an organism’s survival? Explain your reasoning.
Section 6.2 – Process of Meiosis
1. What is the major difference between metaphase I and metaphase II?
2. If, during metaphase 1, all 23 maternal chromosomes lined up on one side of the cell, would genetic diversity
increase? Explain.
3. How do homologous chromosomes differ from sister chromatids?
Section 6.3 – Mendel and Heredity
1. Why is it important that Mendel began with purebred plants?
2. If Mendel had examined only one trait, do you think he would have developed the law of segregation? Explain.
Section 6.4 – Traits, Genes and Alleles
1. Explain how the terms gene, locus and allele are related.
2. If a recessive allele helps an organism reproduce, but the dominant allele hinders reproduction, which will be more
common in a population? Why?
Section 6.5 – Traits and Probability
1. Why does the expected genotypic ration often differ from the expected phenotypic ration resulting from a
monohybrid cross?
2. Explain how Mendel’s laws relate to probability.
3. If you are working with two tall pea plants and know that one is Tt, how could you determine the genotype of the
other plant?
Section 6.6 – Meiosis and Genetic Variation
1. Suppose you know two genes exist on the same chromosome. How could you determine whether they are located
close to each other?
2. How does genetic linkage related to Mendel’s law of independent assortment?
3. How does crossing over contribute to genetic diversity? When does this occur?
4. Mitosis creates daughter cells that are genetically identical to the parent cell. If crossing over occurred between sister
chromatids during mitosis, would it increase genetic diversity? Explain.
Section 7.1 Chromosomes and Phenotypes
1. Why are males more likely than females to have sex-linked genetic disorders?
2. How is the expression of sex-linked genes both similar to and different from the expression of autosomal genes?
3. Scientists hypothesize that over millions of years, the Y chromosome has lost genes to the X chromosome. During
what stages of meiosis might the Y chromosome have transferred genes to the X chromosome? Explain.
4. Can a person be a carrier for a dominant genetic disorder? Explain.
Section 7.4 Human Genetics and Pedigrees
1. How can carriers differ between autosomal and sex-linked disorders?
2. How are pedigrees and Punnett squares different? Explain.
3. Why must a combination of methods be used to study human genetics?
4. How do pedigrees for autosomal genes differ from pedigrees for sex-linked genes?