Skip to main content
Back

BIO 121 Unit 4 Study Guidance: Genetics, Cell Division, and Chromosomes

NotesPracticeVideo lessons

Study Guide - Smart Notes

Tailored notes based on your materials, expanded with key definitions, examples, and context.

Q1. Can I briefly explain the forms of asexual reproduction in eukaryotes and prokaryotes?

Background

Topic: Asexual Reproduction

This question tests your understanding of how organisms reproduce without the fusion of gametes, focusing on both eukaryotic and prokaryotic examples.

Key Terms:

  • Binary fission: Common in prokaryotes (like bacteria).

  • Budding, fragmentation, vegetative propagation: Common in eukaryotes (like yeast, plants, some animals).

Step-by-Step Guidance

  1. List the main forms of asexual reproduction in prokaryotes (e.g., binary fission).

  2. Identify and briefly describe at least two forms of asexual reproduction in eukaryotes (e.g., budding, fragmentation).

  3. Compare the processes in terms of cell division and genetic variation.

Try explaining these forms in your own words before checking the answer!

Q2. Can I explain the steps and results of meiosis and mitosis? Can I explain how they are similar and how they are different?

Background

Topic: Cell Division (Mitosis and Meiosis)

This question tests your ability to describe the processes of mitosis and meiosis, their outcomes, and their similarities and differences.

Key Terms and Concepts:

  • Mitosis: Division of a somatic cell into two genetically identical daughter cells.

  • Meiosis: Division that reduces chromosome number by half, producing four genetically unique gametes.

Step-by-Step Guidance

  1. List the main phases of mitosis (prophase, metaphase, anaphase, telophase) and briefly describe what happens in each.

  2. List the main phases of meiosis I and II, noting key events like crossing over and reduction of chromosome number.

  3. Summarize the results of each process (number of cells produced, chromosome number, genetic similarity).

  4. Identify at least two similarities and two differences between mitosis and meiosis.

Try outlining the steps and differences before checking the answer!

Q3. Can I describe the structure of prokaryotic and eukaryotic chromosomes?

Background

Topic: Chromosome Structure

This question tests your understanding of how genetic material is organized in prokaryotes and eukaryotes.

Key Terms:

  • Prokaryotic chromosome: Usually a single, circular DNA molecule.

  • Eukaryotic chromosome: Multiple, linear DNA molecules associated with histone proteins.

Step-by-Step Guidance

  1. Describe the basic structure of a prokaryotic chromosome (shape, location, associated proteins).

  2. Describe the basic structure of a eukaryotic chromosome (shape, packaging, histones, chromatin).

  3. Compare the two in terms of complexity and organization.

Try describing these structures before checking the answer!

Q4. Do I know how many chromosomes are in human cells?

Background

Topic: Human Chromosome Number

This question tests your knowledge of the diploid and haploid chromosome numbers in humans.

Key Terms:

  • Diploid (2n): The total number of chromosomes in somatic cells.

  • Haploid (n): The number of chromosomes in gametes (sperm or egg).

Step-by-Step Guidance

  1. Recall the diploid chromosome number in typical human somatic cells.

  2. Recall the haploid chromosome number in human gametes.

Try recalling these numbers before checking the answer!

Q5. Do I know what a karyotype is and what it is used for?

Background

Topic: Karyotyping

This question tests your understanding of what a karyotype is and its applications in genetics.

Key Terms:

  • Karyotype: An organized profile of an individual's chromosomes.

Step-by-Step Guidance

  1. Define what a karyotype is in your own words.

  2. List at least two uses of karyotyping in medicine or biology.

Try defining and listing uses before checking the answer!

Q6. Do I know what happens in interphase?

Background

Topic: Cell Cycle - Interphase

This question tests your understanding of the events that occur during interphase, the longest phase of the cell cycle.

Key Terms:

  • G1 phase: Cell growth

  • S phase: DNA replication

  • G2 phase: Preparation for mitosis

Step-by-Step Guidance

  1. List the three main stages of interphase (G1, S, G2).

  2. Briefly describe what happens in each stage.

Try outlining the events of interphase before checking the answer!

Q7. Can I state how mitosis in plants and animals is different?

Background

Topic: Mitosis in Plants vs. Animals

This question tests your understanding of the differences in mitosis between plant and animal cells.

Key Terms:

  • Cell plate formation: Occurs in plant cells during cytokinesis.

  • Cleavage furrow: Occurs in animal cells during cytokinesis.

Step-by-Step Guidance

  1. Describe how cytokinesis occurs in animal cells (cleavage furrow).

  2. Describe how cytokinesis occurs in plant cells (cell plate formation).

  3. Identify at least one structural reason for these differences (e.g., cell wall in plants).

Try stating the differences before checking the answer!

Q8. Can I explain the link between mitosis and cancer?

Background

Topic: Cell Cycle Regulation and Cancer

This question tests your understanding of how errors in cell division can lead to cancer.

Key Terms:

  • Uncontrolled cell division

  • Oncogenes, tumor suppressor genes

Step-by-Step Guidance

  1. Explain how normal mitosis is regulated by the cell cycle checkpoints.

  2. Describe what happens when these controls fail (e.g., mutations in key genes).

  3. Connect this failure to the development of cancer (uncontrolled proliferation).

Try explaining the link before checking the answer!

Q9. Can I briefly state why Mendel’s experiments were so important?

Background

Topic: Mendelian Genetics

This question tests your understanding of the significance of Mendel's work in genetics.

Key Terms:

  • Law of segregation

  • Law of independent assortment

Step-by-Step Guidance

  1. Summarize what Mendel did in his pea plant experiments.

  2. State at least one key discovery or principle that resulted from his work.

  3. Explain why these discoveries were foundational for genetics.

Try stating the importance before checking the answer!

Q10. Can I explain crossing over? Can I explain independent assortment?

Background

Topic: Genetic Variation in Meiosis

This question tests your understanding of two mechanisms that increase genetic diversity during meiosis.

Key Terms:

  • Crossing over: Exchange of genetic material between homologous chromosomes during prophase I of meiosis.

  • Independent assortment: Random distribution of homologous chromosomes during metaphase I of meiosis.

Step-by-Step Guidance

  1. Describe what happens during crossing over and when it occurs in meiosis.

  2. Describe what independent assortment is and when it occurs.

  3. Explain how each process contributes to genetic variation.

Try explaining these processes before checking the answer!

Q11. Can I do the various types of Punnett squares – monohybrid, dihybrid, sex linked, etc.?

Background

Topic: Punnett Squares and Genetic Crosses

This question tests your ability to set up and interpret different types of Punnett squares.

Key Terms and Formulas:

  • Monohybrid cross: One gene, two alleles.

  • Dihybrid cross: Two genes, each with two alleles.

  • Sex-linked cross: Genes located on sex chromosomes.

Step-by-Step Guidance

  1. Identify the genotypes of the parents for the cross.

  2. List all possible gametes each parent can produce.

  3. Set up the Punnett square and fill in the possible offspring genotypes.

  4. Interpret the results in terms of genotype and phenotype ratios.

Try setting up a Punnett square before checking the answer!

Q12. Can I explain Mendel’s law of segregation?

Background

Topic: Mendelian Genetics

This question tests your understanding of one of Mendel's foundational laws.

Key Terms:

  • Law of segregation: Each individual has two alleles for each gene, which separate during gamete formation.

Step-by-Step Guidance

  1. State the law of segregation in your own words.

  2. Explain how this law applies to the formation of gametes during meiosis.

  3. Give an example using a monohybrid cross.

Try explaining the law before checking the answer!

Q13. Do I understand the terms genotype and phenotype, and haploid and diploid?

Background

Topic: Basic Genetic Terminology

This question tests your understanding of key vocabulary in genetics.

Key Terms:

  • Genotype: The genetic makeup of an organism.

  • Phenotype: The observable traits of an organism.

  • Haploid (n): One set of chromosomes.

  • Diploid (2n): Two sets of chromosomes.

Step-by-Step Guidance

  1. Define genotype and phenotype in your own words.

  2. Define haploid and diploid, and give examples of each in humans.

Try defining these terms before checking the answer!

Q14. Do I understand the purpose of and the procedure for a test cross?

Background

Topic: Test Cross in Genetics

This question tests your understanding of how a test cross is used to determine an unknown genotype.

Key Terms:

  • Test cross: Crossing an individual with a dominant phenotype with a homozygous recessive individual.

Step-by-Step Guidance

  1. State the purpose of a test cross.

  2. Describe the procedure for performing a test cross.

  3. Explain how the results can reveal the unknown genotype.

Try outlining the purpose and steps before checking the answer!

Q15. Can I explain linkage, codominance, epistasis, polyploidy, and polygenic inheritance?

Background

Topic: Non-Mendelian Genetics

This question tests your understanding of genetic phenomena that do not follow simple Mendelian inheritance.

Key Terms:

  • Linkage: Genes located close together on the same chromosome tend to be inherited together.

  • Codominance: Both alleles are fully expressed in the phenotype.

  • Epistasis: One gene affects the expression of another gene.

  • Polyploidy: More than two sets of chromosomes.

  • Polygenic inheritance: Multiple genes influence a single trait.

Step-by-Step Guidance

  1. Define each term in your own words.

  2. Give an example of each phenomenon.

  3. Explain how each differs from simple Mendelian inheritance.

Try explaining each concept before checking the answer!

Q16. Can I explain nondisjunction and describe genetic disorders caused by this?

Background

Topic: Chromosome Disorders

This question tests your understanding of errors in chromosome separation and their consequences.

Key Terms:

  • Nondisjunction: Failure of chromosomes to separate properly during meiosis.

  • Aneuploidy: Abnormal number of chromosomes.

Step-by-Step Guidance

  1. Define nondisjunction and explain when it can occur during meiosis.

  2. Describe how nondisjunction leads to aneuploidy.

  3. List at least one genetic disorder caused by nondisjunction (e.g., Down syndrome).

Try explaining nondisjunction before checking the answer!

Q17. Can I read a pedigree?

Background

Topic: Pedigree Analysis

This question tests your ability to interpret family trees showing inheritance patterns.

Key Terms:

  • Pedigree: A diagram showing family relationships and inheritance of traits.

  • Symbols: Squares (males), circles (females), shaded (affected), unshaded (unaffected).

Step-by-Step Guidance

  1. Identify the symbols used in a pedigree chart.

  2. Determine the inheritance pattern (dominant, recessive, sex-linked) based on the pedigree.

  3. Practice tracing the inheritance of a trait through generations.

Try reading a sample pedigree before checking the answer!

Pearson Logo

Study Prep