NARAYANKAR NOTES

1. Which molecule is responsible for carrying genetic information for growth, development, and reproduction? A. Proteins B. Nucleic Acids C. Carbohydrates D. Lipids 2. What are the two main types of nucleic acids found in living cells? A. DNA and ATP B. RNA and ADP C. DNA and RNA D. Glucose and DNA 3. Which sugar is found in the nucleotides of DNA? A. Ribose B. Glucose C. Deoxyribose D. Fructose 4. In RNA, which nitrogenous base replaces Thymine? A. Adenine B. Guanine C. Cytosine D. Uracil 5. What is the structural difference between DNA and RNA? A. DNA is single-stranded, RNA is double-stranded B. DNA is double-stranded, RNA is single-stranded C. Both are always double-stranded D. Both are always single-stranded 6. Where is DNA located in a prokaryotic cell? A. Nucleus B. Mitochondria C. Nucleoid region D. Golgi apparatus 7. Which of the following describes the DNA structure in eukaryotes? A. Circular and single loop B. Linear and organized into chromosomes C. Scattered freely in the ...

3.8 Linkage and Crossing Over 1. Linkage (Basic Meaning) Linkage means genes staying together during inheritance. Many genes are present on the same chromosome . Since chromosomes carry heredity, these genes tend to pass together from parents to offspring . Such genes are called linked genes . 👉 Definition (simple): Linkage is the tendency of two or more genes on the same chromosome to be inherited together. 2. Discovery of Linkage In plants → discovered by William Bateson and Reginald Punnett In animals → discovered by Thomas Hunt Morgan 3. Types of Linkage I. Complete Linkage (Strong Linkage) Genes are very close to each other on the chromosome. Because they are so close → no crossing over happens (no exchange of genetic material). So, genes do not separate during inheritance. 👉 Result: Offspring show same traits as parents (no new combinations). 👉 Example: Drosophila melanogaster males (X chromosome shows complete linkage) II. Incomplete Linkage (Weak Linkage) Genes are far ...

Solid State MCQ Practice Chemistry | MHT-CET Previous year questions with detailed solutions MHT-CET 2015 Q1. Select a ferromagnetic material from the following. (A) Dioxygen (B) Chromium(IV) oxide (C) Benzene (D) Dihydrogen monoxide Correct Answer (B) Chromium(IV) oxide Detailed Explanation: Ferromagnetism: These are substances that show permanent magnetism even when an external magnetic field is removed. This happens because the magnetic moments (domains) align spontaneously in the same direction. While common metals like Iron (Fe), Cobalt (Co), and Nickel (Ni) are ferromagnetic, Chromium(IV) oxide (CrO 2 ) is a key example of a ferromagnetic metallic oxide. Due to ...