Understanding Meiosis and Fertilization
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

During which stage of meiosis does crossing over occur?

  • Metaphase-II
  • Anaphase-I
  • Prophase-I (correct)
  • Prophase-II
  • What is the significance of crossing over in meiosis?

  • It results in genetically identical gametes
  • It prevents the formation of chiasmata
  • It leads to unique combinations of genetic material (correct)
  • It reduces the number of chromosomes
  • Why are unicellular organisms that reproduce asexually at a higher risk of extinction compared to sexually reproducing organisms?

  • They have more genetic diversity
  • They lack genetic variation (correct)
  • They have better adaptation abilities
  • They produce a larger number of offspring
  • Which stage of meiosis involves synapsis, where homologous chromosomes pair up?

    <p>Prophase-I</p> Signup and view all the answers

    How many possible genetic combinations can be produced by a human cell with 23 pairs of homologous chromosomes?

    <p>Over 8 million possibilities</p> Signup and view all the answers

    What is the term for the structures formed when homologues are linked together during crossing over?

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

    In humans, how many gametes are produced after one cycle of meiosis from a cell with 23 pairs of homologous chromosomes?

    <p>4</p> Signup and view all the answers

    What is the main advantage of genetic flexibility in a population for handling changing ecological conditions?

    <p>Better adaptation to changing environments</p> Signup and view all the answers

    What is the term used to describe the process of homologous chromosomes coming together and pairing up during prophase-I of meiosis?

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

    What is the maximum number of chiasmata (cross-shaped structures) that can form between a pair of homologous chromosomes during crossing over?

    <p>Multiple chiasmata can form</p> Signup and view all the answers

    Which of the following statements accurately describes the genetic composition of sister chromatids after crossing over?

    <p>One sister chromatid is identical to the parental chromosome, while the other has a new combination of genetic material.</p> Signup and view all the answers

    What is the primary advantage of genetic variation introduced by meiosis and crossing over in a population?

    <p>It provides better adaptation to changing environmental conditions.</p> Signup and view all the answers

    What is the term used to describe the unique combinations of genetic material derived from both parents that are formed in one of the sister chromatids after crossing over?

    <p>Novel combinations</p> Signup and view all the answers

    If crossing over did not occur during meiosis, what would be the consequence for genetic variation in a population?

    <p>Decreased genetic variation due to lack of novel genetic combinations</p> Signup and view all the answers

    During which stage of meiosis do the sister chromatids separate and assort independently as genetically distinct gametes?

    <p>Metaphase-II</p> Signup and view all the answers

    What is the term used to describe the process of DNA being broken and reconnected in a crisscross pattern during crossing over?

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

    Which of the following statements accurately describes the significance of crossing over in meiosis?

    <p>It introduces new genetic variations in the population pool with each cycle of meiosis and fertilization.</p> Signup and view all the answers

    What is the term used to describe the genetic material that makes up each chromosome, consisting of two identical strands?

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

    More Like This

    Use Quizgecko on...
    Browser
    Browser