Biotechnology and Molecular Genetics in Plant and Animal Breeding Introduction
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Questions and Answers

What was the significance of T.H. Morgan's work in genetic mapping?

  • He proposed the theory of meiotic crossing over
  • He introduced the concept of positive mutations driving evolution
  • He developed genetic maps based on relative gene positions (correct)
  • He discovered the process of synapsis during meiosis

Which event in the 1940s led to the combining of Mendelian genetics, Darwinism, and population genetics?

  • Three-factor crosses to determine gene distance
  • Modern synthesis (correct)
  • Introduction of positive mutations as drivers of evolution
  • Discovery of meiotic crossing over

What is the primary function of mutations in the context of evolution?

  • To disrupt the process of synapsis
  • To prevent meiotic crossing over
  • To maintain stable gene positions
  • To introduce genetic variability (correct)

How did Janssen contribute to our understanding of genetic variability?

<p>By describing meiotic crossing over between chromosomes (B)</p> Signup and view all the answers

What did Rudolf Virchow contribute to cytogenetics?

<p>He introduced the concept of invisible factors determining organism traits (B)</p> Signup and view all the answers

What key concept of Mendel's first law involves the phenotype of a cross being intermediate?

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

Which statement best summarizes Mendel's second law of independent segregation?

<p>Genes segregate independently during gamete formation (B)</p> Signup and view all the answers

What conclusion did Mendel draw regarding the appearance and genetic composition of individuals?

<p>Genetic composition determines appearance (B)</p> Signup and view all the answers

Which ancient Greek philosopher proposed the theory of preformation, suggesting that the embryo in its entirety already exists in the semen?

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

Karl Ernst von Baer developed four rules about embryonic development. One of the rules states that:

<p>The more general characters of a large group appear earlier in the embryo than the more special characters. (A)</p> Signup and view all the answers

Who is best known for the discovery and explanation of the structure of the chick germ layers?

<p>Christian Heinrich Pander (D)</p> Signup and view all the answers

Which scientist theorized about the inheritance of acquired characteristics?

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

According to Aristotle, genetic material is only provided by which gender of individuals?

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

Who conducted groundbreaking work on chicken embryos?

<p>Christian Heinrich Pander (B)</p> Signup and view all the answers

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