Genetics Fundamentals and Inheritance

Revision sheet excerpt

Course Outline

  1. Mendelian Genetics
  2. Non-Mendelian Inheritance
  3. Genetic Terminology
  4. Punnett Squares
  5. Pedigree Analysis
  6. Sex-linked Traits
  7. Meiosis Process
  8. Genetic Variation
  9. Mitosis vs. Meiosis

1. Mendelian Genetics

Key Concepts & Definitions

  • Gregor Mendel (1865): The "father" of genetics, who conducted experiments breeding pea plants to understand how traits are inherited and discovered fundamental genetic principles.
  • Mendelian inheritance patterns: The basic principles of how traits are passed from parents to offspring, including concepts of dominant and recessive alleles, and the segregation and independent assortment of genes.
  • Dominant and recessive allele expression in Mendelian traits: In Mendelian inheritance, the dominant allele is expressed in the phenotype if present, while the recessive allele is only expressed when paired with another recessive allele, as established by Mendel's experiments.
  • P generation: The original parent organisms in a genetic cross, serving as the starting point for breeding experiments.
  • F1 generation: The first filial generation, consisting of the offspring resulting from a cross between P generation individuals. Mendel observed that F1 offspring typically express the dominant trait.
  • F2 generation: The second filial generation, produced by crossing F1 individuals, where Mendel noted the reappearance of recessive traits in a predictable ratio,…
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Quiz preview

1. What is a key difference between mitosis and meiosis in terms of the daughter cells produced?

2. When were Punnett Squares first established as a tool for predicting genetic crosses?

3. What is a direct effect of the meiosis process on genetic inheritance?

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Flashcards preview

Mendelian inheritance patterns

Traits follow dominant and recessive principles.

P generation — definition?

Original parent organisms in a genetic cross.

F1 generation — role?

First offspring from P generation cross.

F2 generation — significance?

Second filial, shows recessive traits reappear.

Non-Mendelian inheritance — examples?

Incomplete dominance, codominance, multiple alleles.

Incomplete dominance — outcome?

Heterozygotes show intermediate phenotype.

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