Biology Inheritance Principle part 7 (Genes & Alleles) class 12 XII

TL;DR

Genes are the units of inheritance, controlling the traits of living organisms through proteins synthesized based on the sequence of DNA bases.

Transcript

hello friends this video on principles of inheritance part 7 is brought to you by example.com no more fear from exam what are genes genes are nothing but the units of inheritance however mendel called these genes as factors that time later on the term gene was used so they are like units of inheritance so they are basically that component which car... Read More

Key Insights

• 💁 Genes are the units of inheritance, carrying information for inheriting traits.
• #️⃣ Chromosomes contain thousands of genes, and the number of chromosomes is constant for each organism.
• ❓ DNA, composed of sequences of bases, instructs cells to synthesize proteins, which determine traits.
• 🫒 Proteins, determined by their structure, govern all physical traits of living organisms.
• 💁 Alleles are different forms of the same gene and code for contrasting traits.
• 👪 Organisms inherit two alleles for each gene, one from each parent.
• 😑 The combination of alleles determines the traits expressed in offspring.

Questions & Answers

Q: What are genes and how do they control the traits of living organisms?

Genes are units of inheritance that carry information required to inherit traits. These genes control traits by instructing cells to synthesize proteins, which determine physical characteristics.

Q: What is the role of DNA in gene expression?

DNA, composed of sequences of bases, instructs cells to produce specific proteins through its sequences. The sequence of bases in DNA determines the traits expressed by an organism.

Q: How do proteins determine the traits of living organisms?

Proteins are responsible for all traits in living organisms, as their structure determines their function. Changes in proteins can lead to changes in physical features, such as height or eye color.

Q: What are alleles and how do they relate to genes?

Alleles are slightly different forms of the same gene. Each gene has two alleles, one inherited from the father and one from the mother. Alleles can be the same or different, representing contrasting traits.

Summary & Key Takeaways

• Genes are units of inheritance that carry information needed to inherit traits from one generation to the next.

• Each living organism is made up of cells, and within the nucleus of each cell, there are chromosomes that contain thousands of genes.

• Genes control the traits of organisms by instructing cells to synthesize specific proteins, which determine physical characteristics.