Biology Inheritance Principle part 12 (Mendel's law of dominance & segregation) class 12 XII | Summary and Q&A

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May 2, 2015
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Biology Inheritance Principle part 12 (Mendel's law of dominance & segregation) class 12 XII

TL;DR

Mendel observed that dominant traits express themselves in heterozygous organisms, while recessive traits remain hidden. He also discovered that alleles retain their distinct identity and segregate during gamete formation.

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Key Insights

  • 👮 Mendel's experiments with monohybrid crosses led to the discovery of the law of dominance and the law of segregation, which form the basis of modern genetics.
  • 👮 The law of dominance explains how dominant traits express themselves in heterozygous organisms, while the law of segregation describes how alleles retain their identity during gamete formation.
  • 👨‍🔬 While Mendel's laws were groundbreaking, further research has shown that there are exceptions and complexities to these principles.
  • 💨 Mendel's contributions paved the way for future scientists to delve deeper into the field of genetics and expand our understanding of inheritance.
  • 👮 Blending between alleles and incomplete segregation have been observed in certain scenarios, challenging the simplicity of Mendel's laws.
  • 🪈 Mendel's experimental approach and meticulous record-keeping were instrumental in his groundbreaking discoveries.
  • 🏑 The concepts of dominance and segregation continue to be fundamental in genetics and are applied in various fields, including genetic engineering and selective breeding.

Transcript

hello friends this video on principles of inheritance part 12 is brought to you by example.com no more fear from exam so now based on the monohybrid cross or based on this experiment performed by mendel he gave very important principles of inheritance and these were the basic principles of genetics and what were those principles they were law of do... Read More

Questions & Answers

Q: What is the law of dominance in genetics?

The law of dominance states that in heterozygous organisms, one allele (dominant) expresses itself while the other (recessive) remains hidden. This explains how certain traits are passed on from one generation to the next.

Q: How does the law of segregation relate to genetics?

The law of segregation states that each allele retains its distinct identity and does not blend with other alleles. During gamete formation, the alleles segregate but recombine after fusion, ensuring the preservation of specific traits.

Q: What were Mendel's major contributions to the field of genetics?

Mendel's major contributions include the discovery of the law of dominance and the law of segregation, which helped establish the principles of inheritance. He conducted experiments with pea plants, laying the foundation for modern genetics.

Q: Why were Mendel's laws considered incomplete?

Later research found scenarios where blending between alleles was observed, suggesting that Mendel's law of dominance was not universally applicable. Additionally, the law of segregation was found to be partially correct in certain cases.

Summary & Key Takeaways

  • Mendel's first law, the law of dominance, states that in heterozygous organisms, only one allele expresses itself as the dominant trait, while the other remains recessive.

  • The law of segregation explains that each allele retains its own identity and does not blend with other alleles. During gamete formation, the alleles segregate but recombine after fusion.

  • Mendel's laws were based on his experiments with monohybrid crosses and laid the foundation for our understanding of inheritance.

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