Chp. 14 - Exam 3 Bio 190
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Questions and Answers

Which term describes the two identical copies of a chromosome joined at the centromere?

  • Haploid cell
  • Homologous chromosomes
  • Diploid cell
  • Sister chromatids (correct)

A diploid cell contains two sets of chromosomes.

True (A)

What are homologous chromosomes?

Pairs of chromosomes that have the same structure and gene sequence, one inherited from each parent.

In the eukaryotic cell cycle, the phase where the cell prepares for mitosis is called the ______.

<p>G2 phase</p> Signup and view all the answers

Match the following terms with their descriptions:

<p>Sister chromatids = Identical copies of a chromosome Diploid cell = Cell with two sets of chromosomes Haploid cell = Cell with one set of chromosomes Homologous chromosomes = Chromosomes that pair during meiosis</p> Signup and view all the answers

What is the primary role of checkpoints in the cell cycle?

<p>To regulate the advancement of a cell through the cycle (A)</p> Signup and view all the answers

Cyclins are a type of protein that regulate the cell cycle by binding to and activating cyclin-dependent kinases (cdks).

<p>True (A)</p> Signup and view all the answers

What are sister chromatids?

<p>Duplication copies of a chromosome that are joined together after DNA replication.</p> Signup and view all the answers

In eukaryotic cells, the __________ phase is when DNA replication occurs.

<p>S (synthesis)</p> Signup and view all the answers

Match the cell cycle phase with its description:

<p>G1 phase = Cell growth and preparation for DNA synthesis S phase = DNA replication occurs G2 phase = Preparation for mitosis and further growth M phase = Division of the cell nucleus and cytoplasm</p> Signup and view all the answers

How many total chromosomes are present in the human genome?

<p>46 (D)</p> Signup and view all the answers

During all phases of the cell cycle, cells are continuously dividing.

<p>False (B)</p> Signup and view all the answers

What phase of the cell cycle occurs before mitosis, during which DNA is replicated?

<p>S phase (B)</p> Signup and view all the answers

During mitosis, the daughter cells produced are genetically different from the mother cell.

<p>False (B)</p> Signup and view all the answers

What are the identical copies of a replicated chromosome called?

<p>sister chromatids</p> Signup and view all the answers

The original cell that divides during mitotic cell division is known as the ______.

<p>mother cell</p> Signup and view all the answers

Which of the following best describes the function of the spindle apparatus?

<p>To separate sister chromatids during mitosis (C)</p> Signup and view all the answers

Match the following phases of mitosis with their key events:

<p>Prophase = Nuclear envelope breaks down Metaphase = Chromosomes align at the cell's equator Anaphase = Sister chromatids are pulled apart Telophase = Nuclear envelope reforms around each set of chromosomes</p> Signup and view all the answers

Name the two processes involved in mitotic cell division.

<p>mitosis and cytokinesis</p> Signup and view all the answers

Mitosis produces two genetically identical ______ from one ______.

<p>daughter cells, mother cell</p> Signup and view all the answers

Eukaryotic chromosomes are not compacted before mitosis.

<p>False (B)</p> Signup and view all the answers

What is the primary role of the spindle apparatus during cell division?

<p>It organizes and sorts chromosomes. (C)</p> Signup and view all the answers

Centrosomes are found in both animal and plant cells.

<p>False (B)</p> Signup and view all the answers

What happens during cytokinesis in animal cells?

<p>A cleavage furrow forms to separate the cells.</p> Signup and view all the answers

In plant cells, vesicles from the Golgi move along microtubules to form a __________.

<p>cell plate</p> Signup and view all the answers

Match the following components with their definitions:

<p>Centrosome = Microtubule organizing center in animal cells Cytokinesis = Division of the cytoplasm Microtubules = Components of the spindle apparatus Chromatid = Replicated chromosome part</p> Signup and view all the answers

Which statement correctly describes the process of mitosis?

<p>Sister chromatids are separated to form two daughter cells. (D)</p> Signup and view all the answers

Crossing over occurs during meiosis only.

<p>True (A)</p> Signup and view all the answers

Name the two main outcomes of mitosis.

<p>Two genetically identical daughter cells.</p> Signup and view all the answers

Each centrosome defines a __________ of the spindle apparatus during mitosis.

<p>pole</p> Signup and view all the answers

Flashcards

Eukaryotic cell cycle

Series of events that result in cell division

Sister chromatids

Identical copies of a chromosome formed by DNA replication.

Diploid cell

A cell containing two sets of chromosomes (one from each parent).

Haploid cell

A cell with only one set of chromosomes

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Homologous chromosomes

Pairs of chromosomes with similar genes on them, one from each parent.

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Cell cycle

A series of events in a cell leading to its division.

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Cyclins

Proteins that regulate the cell cycle by controlling the activity of CDKs.

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Cyclin-dependent kinases (CDKs)

Enzymes that drive the cell cycle when activated by cyclins.

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Checkpoints

Control points in the cell cycle that ensure accurate progression.

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G1 phase

The first gap phase in the cell cycle where growth occurs.

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S Phase

The phase of DNA replication in the cell cycle

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M phase

The phase of cell division (mitosis and cytokensis)

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What happens to DNA before mitosis?

DNA is replicated during S phase of the cell cycle. The copy is attached to the original and forms sister chromatids.

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Mitosis

A type of cell division that produces two genetically identical daughter cells from a single parent cell.

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Cytokinesis

The division of the cytoplasm of a cell after mitosis, resulting in two separate daughter cells.

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Asexual Reproduction

A form of reproduction where a single parent produces offspring that are genetically identical to itself.

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Function of Mitosis in Multicellular Organisms

Mitosis is used for growth, development, and repair of tissues in multicellular organisms.

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Mother Cell

The original cell before cell division.

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Daughter Cells

The two new cells produced by cell division.

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Spindle Apparatus

A structure made of microtubules that organizes and sorts chromosomes during cell division, ensuring that each daughter cell receives a complete set of chromosomes.

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Centrosomes

The microtubule organizing centers in animal cells, responsible for the formation and organization of the spindle apparatus during cell division.

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Mitosis: Big Goal

The primary goal of mitosis is to accurately separate replicated chromosomes, sending one copy to each daughter cell.

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Cytokinesis in Animal Cells

In animal cells, cytokinesis involves the formation of a cleavage furrow, which constricts like a drawstring to pinch off the cytoplasm and separate the two daughter cells.

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Cytokinesis in Plant Cells

In plant cells, cytokinesis occurs through the formation of a cell plate, which grows outwards from the center of the cell, eventually forming a new cell wall to separate the daughter cells.

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Synapsis

The process during meiosis where homologous chromosomes pair up lengthwise, aligning their genes.

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Crossing Over

The exchange of genetic material between non-sister chromatids of homologous chromosomes during synapsis.

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Meiosis Phases

Meiosis consists of two rounds of cell division (Meiosis I and Meiosis II) resulting in four haploid daughter cells with unique combinations of chromosomes.

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Meiosis Outcomes

Meiosis generates genetic diversity by shuffling chromosomes and promoting the creation of unique combinations of genes in gametes (eggs and sperm).

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Study Notes

Chapter 14 - How Eukaryotic Cells Sort and Transmit Chromosomes: Mitosis and Meiosis

  • The chapter outlines the eukaryotic cell cycle, mitotic cell division, meiosis, sexual reproduction, and variations in chromosome structure and number.
  • Important ideas are highlighted in blue font, and key terms are bolded.

14.1 The Eukaryotic Cell Cycle

  • Cell division is a highly regulated process, involving a series of events that results in cell division
  • The eukaryotic cell cycle includes phases like G1 (growth), S (synthesis or DNA replication), G2 (growth), and M (mitosis).
  • Cyclin-dependent kinases (CDKs) and cyclins work together to regulate the cell cycle progressing through these phases.
  • The progression through the cell cycle is regulated by checkpoints (G1, G2, and metaphase).
  • Key terms and sketches are included for sister chromatids, diploid cell, haploid cell, homologous chromosomes, etc.
  • A karyotype reveals the number, size, and form of chromosomes when preparing to divide.
  • The chromosomes become compact enough to be seen under a light microscope during cell division preparation.

14.2 Mitotic Cell Division

  • Mitotic cell division produces two new genetically identical cells, from a single mother cell that divides.
  • The process involves mitosis and cytokinesis
  • Mitosis is used in asexual reproduction and multicellular organism growth.
  • DNA replicates in S-phase to create sister chromatids.
  • The spindle apparatus organizes and sorts the chromosomes. Microtubules form this structure that grows from the centrosomes.
  • The process involves the phases: interphase, prophase, prometaphase, metaphase, anaphase, telophase, and cytokinesis.
  • Cytokinesis is different in plant and animal cells (cleavage furrow vs. cell plate).

14.3 Meiosis

  • Meiosis is the process of sexual reproduction, creating genetically diverse gametes (sperm and egg cells) for humans.
  • Meiosis I separates homologous chromosomes.
  • Meiosis II separates sister chromatids.
  • Meiosis and mitosis are compared and contrasted – focusing on the different outcomes of the two processes.
  • Key phases of meiosis, including prophase I, prometaphase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, and telophase II, are described.

14.4 Sexual Reproduction

  • Sexual reproduction involves two haploid gametes fusing together to form a diploid zygote.
  • Random alignment of homologous chromosomes and crossing over during meiosis are important processes driving genetic diversity in offspring.
  • Different types of life cycles in different organisms exist: diploid-dominant, haploid-dominant, or alternation of generations.

14.5 Variation in Chromosome Structure and Number

  • Chromosome structures varies in size, centromere location, and number across different species.
  • Euploidy refers to chromosome number variations that occur in complete sets.
  • Aneuploidy refers to chromosome number variations that occur in single chromosomes.
  • Variations in chromosome number can have major effects on organisms, often causing survivable or lethal conditions, depending on which chromosomes have variations.
  • Four types of chromosomal mutations: deletions, duplications, inversions, and translocations exist.
  • Processes within meiosis that impact chromosomal structures are discussed.

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Description

This quiz covers Chapter 14, focusing on how eukaryotic cells sort and transmit chromosomes through processes such as mitosis and meiosis. It details the phases of the eukaryotic cell cycle, the roles of cyclins and CDKs, and the importance of checkpoints. Key terms and chromosome structures are also highlighted for better understanding.

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