Chromosome Loss Compensation in Homeologous Group Quiz
17 Questions
3 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

What did Muramatsu demonstrate about the ssp.dicoccum var.liguliforme?

  • It is a hexaploid wheat variety
  • It has square heads
  • It has round glumes
  • It possesses the Q genotype (correct)
  • What did Muramatsu find about the ssp.carthlicum in his experiments?

  • It carries the q genotype
  • It has round glumes
  • It is of QQ genotype (correct)
  • It is a hexaploid wheat variety
  • According to Muramatsu's experiments, what happens to the range of variation of characters when Q is present in tetraploid wheats?

  • It becomes very narrow
  • It disappears completely
  • It remains unchanged
  • It widens significantly (correct)
  • What is the primary purpose of monosomic analysis in wheat?

    <p>To identify the location of genes on specific chromosomes</p> Signup and view all the answers

    Which statement best describes the genetic complexity in hexaploid wheats with regards to the presence of Q?

    <p>Genetic background can influence glume keeledness in hexaploids with Q</p> Signup and view all the answers

    Based on Muramatsu's findings, what can be inferred about the phenotypic variation in tetraploid wheats without the Q allele?

    <p>It remains narrow</p> Signup and view all the answers

    What is the role of the three crossability genes (kr1, kr2, kr3) identified in Chinese Spring wheat?

    <p>They facilitate crossing between wheat and rye</p> Signup and view all the answers

    What did Muramatsu conclude about the expression of phenotypic variation in different QQ lines of tetraploid wheats?

    <p>Variation is very narrow but obvious</p> Signup and view all the answers

    Which of the following is a key characteristic of homeologous chromosomes in hexaploid wheat?

    <p>They can compensate for the loss of genes on other homeologs</p> Signup and view all the answers

    What is a key advantage of using alien tetraploid species in wheat improvement?

    <p>Tetraploids can overcome the crossability barriers between wheat and diploid alien species</p> Signup and view all the answers

    What is the significance of E.R. Sears' development of a complete set of 21 monosomics in the hexaploid wheat cultivar Chinese Spring?

    <p>It provided a valuable tool for locating genes on specific wheat chromosomes</p> Signup and view all the answers

    Why has the exploitation of alien germplasm for wheat improvement been limited?

    <p>Lack of crossability between wheat and alien species</p> Signup and view all the answers

    Which of the following is the most correct description of the evolution of hexaploid wheats?

    <p>Hexaploid wheats evolved from the combination of tetraploid wheats and a diploid grass species, Ae. squarrosa.</p> Signup and view all the answers

    Which of the following best describes the genome composition of hexaploid wheats?

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

    What is the purpose of the Ph gene located on chromosome 5B in hexaploid wheat?

    <p>It prevents homeologous chromosome pairing.</p> Signup and view all the answers

    Which of the following best describes the relationship between the chromosomes in a homeologous group in hexaploid wheat?

    <p>The chromosomes are closely related but do not pair during meiosis due to the Ph gene.</p> Signup and view all the answers

    What is the proposed origin of the tetraploid wheats (AABB genome)?

    <p>They evolved from a natural hybridization between T. monococcum (AA) and an unknown species that donated the B genome.</p> Signup and view all the answers

    More Like This

    Unraveling Homologous Chromosomes
    50 questions
    Chromosomes and Homologous Pairs Quiz
    12 questions
    Chromosomes and Homologous Pairs
    79 questions
    Use Quizgecko on...
    Browser
    Browser