Biology Inheritance Principle part 32 (Gene mapping) class 12 XII

TL;DR

This video explains the concept of gene mapping and the relationship between gene linkage and crossing over.

Transcript

hello friends this video on principles of inheritance part 32 is brought to you by exam feel calm no more fear from exam so now this was another important contribution which was given by more than so more than talked about linkage more than talked about sex-linked inheritance so these were some of the very important contribution of Morgan apart fro... Read More

Key Insights

• 🍻 Morgan made important contributions to the understanding of inheritance, including sex-linked inheritance and gene mapping.
• ❓ Gene mapping is a technique used to locate genes on chromosomes.
• 😵 Gene linkage and crossing over are inversely related, meaning that closer genes have a lower likelihood of crossing over.
• 😚 Complete linkage occurs when genes are very close on the same chromosome, resulting in no crossing over or recombination.
• ❓ The distance between genes on a chromosome can be determined by the recombination frequency.
• 🍁 Genetic maps are created based on the map units, which represent the distance between genes on a chromosome.
• 🍁 The order of genes on a linkage map can be determined using the crossover values between pairs of genes.

Questions & Answers

Q: What is gene mapping and why is it important?

Gene mapping is a technique used to locate genes on chromosomes. It is important because it helps scientists understand the relationship between genes and their positions on chromosomes.

Q: How does gene linkage affect crossing over?

Gene linkage refers to how close genes are located on the same chromosome. The closer the genes, the less likely there will be crossing over and recombinations.

Q: What is complete linkage?

Complete linkage occurs when two genes are very close on the same chromosome. In this case, there is no crossing over, and the genes are inherited together without any recombination.

Q: How is the distance between genes determined in gene mapping?

The distance between genes is determined by the recombination frequency, which is calculated by dividing the number of recombinants by the total population and multiplying by 100.

Summary & Key Takeaways

• The video discusses the important contributions of Morgan, including sex-linked inheritance and gene mapping.

• Gene mapping is a technique used to locate genes on chromosomes using the concept of gene linkage and crossing over.

• The distance between genes on a chromosome determines the likelihood of crossing over and recombinations.