Biology Inheritance Principle part 13 (Incomplete dominance) class 12 XII

TL;DR

Incomplete dominance is when one trait only partially dominates another, resulting in an intermediate phenotype. The phenotypic ratio for incomplete dominance is 1:2:1.

Transcript

hello friends this video on principles of inheritance part 13 is brought to you by example.com no more fear from exam with time came up other concepts of dominance because other scientists were also studying these uh that the field of genetics and they were also coming up with new results from new experiments so there came the concept of in complet... Read More

Key Insights

• 👶 Other scientists studying genetics discovered the concept of incomplete dominance due to new experiments and results.
• ❓ Incomplete dominance is also known as semi-dominance, where traits only partially dominate.
• 👪 The phenotype of offspring in incomplete dominance does not resemble either parent but is a blend of both traits.
• 😵 Monohybrid crosses for incomplete dominance result in an F2 generation with a phenotypic ratio of 1:2:1.
• 🥳 Genotypic and phenotypic ratios are the same in incomplete dominance, unlike Mendel's principles.
• 🌱 Incomplete dominance can be observed in various organisms, including plants and humans.
• 👮 The concept of incomplete dominance challenges Mendel's laws of inheritance, particularly the principle of dominance.

Questions & Answers

Q: What is incomplete dominance?

Incomplete dominance is the concept where neither of the two traits completely dominates, resulting in an intermediate phenotype that is a blend of both traits.

Q: How does incomplete dominance differ from Mendel's principle of dominance?

In Mendel's principle, one trait completely dominates the other, while in incomplete dominance, blending occurs, resulting in an intermediate phenotype.

Q: What are some examples of incomplete dominance?

Examples of incomplete dominance include the formation of pink flowers from red and white flowers and the manifestation of wavy hair from curly-haired and straight-haired parents.

Q: Does incomplete dominance affect the phenotypic ratio?

Yes, in incomplete dominance, the phenotypic ratio is 1:2:1, which means one trait dominates, two traits blend, and one trait is recessive.

Summary & Key Takeaways

• Incomplete dominance is the concept of partial dominance, where neither trait completely dominates the other, resulting in an intermediate phenotype.

• Mendel's principle of dominance cannot explain scenarios of incomplete dominance, where blending of traits occurs.

• Examples of incomplete dominance include the formation of pink flowers from red and white flowers, as well as the manifestation of wavy hair from curly-haired and straight-haired parents.