NEET Biology Genetics : Polygenic Inheritance (Wheat Kernel Experiment)

TL;DR

The video explains polygenic inheritance in plants using an experiment on kernel color, showing that multiple genes determine the color of the kernels.

Transcript

hello friends this video on need genetics is brought to you by exams you're calm no more fear from exam when a question is when Polytechnic inheritance was first talked about because long long time ago Mendel had performed experiments and he had given the principles of inheritance which is also known as the mammalian inheritance so later then peopl... Read More

Key Insights

• ❓ Polygenic inheritance explains the variation of traits that cannot be explained by monogenic inheritance alone.
• 🌱 Kernel color in plants is determined by multiple genes, denoted as A and B.
• 👨‍🦳 An experiment by Sonne in 1908 provided experimental evidence for polygenic inheritance using red and white kernel plant varieties.
• 👨‍🦳 The F1 generation of the experiment exhibited an intermediate color between red and white.
• 👨‍🦳 The F2 generation showed a range of colors, including red, white, and intermediate shades, demonstrating continuous variation.
• 🥳 The phenotypic ratio in the F2 generation reflected the contribution of different genes and alleles to the kernel color.
• ❓ The experiment highlights the complexity of trait inheritance and the role of multiple genes in determining phenotypes.

Questions & Answers

Q: What is polygenic inheritance?

Polygenic inheritance involves the contribution of multiple genes to a single phenotype, such as kernel color, resulting in a range of intermediate variations.

Q: How did Sonne provide experimental evidence for polygenic inheritance?

Sonne crossed a red kernel variety with a white kernel variety of plants and observed that the offspring in the F1 generation exhibited an intermediate color between red and white.

Q: How many genes are involved in determining kernel color in plants?

Two pairs of genes, denoted as A and B, determine the kernel color in plants. These genes can have dominant or recessive alleles that contribute to the production of red or white color.

Q: What colors are observed in the F2 generation of Sonne's experiment?

The F2 generation showed a range of colors, including red, white, and various intermediate shades of pink and dark red, indicating continuous variation due to polygenic inheritance.

Summary & Key Takeaways

• Mendel's experiments laid the foundation for the principles of inheritance, also known as monogenic inheritance.

• Polygenic inheritance, which involves multiple genes, was later introduced to explain the variation in traits like kernel color in plants.

• An experiment conducted by Sonne in 1908 provided the first experimental evidence of polygenic inheritance using different varieties of red and white kernel plants.