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Important Points to Remember: - Mendelian laws form the foundation of inheritance. - Chromosomal theory connects Mendelian genetics to chromosomes. - Mutation and recombination contribute to genetic diversity. - Pedigree analysis is crucial for studying genetic disorders. - Sex determination systems vary across species.

Mendelian Disorders - Single-gene disorders such as Sickle Cell Anemia, Cystic Fibrosis, and Hemophilia. - Usually follow simple inheritance patterns. Polygenic Inheritance and Multiple Alleles - Polygenic Traits: Controlled by multiple genes (e.g., skin color, height). - Multiple Alleles: More than two allele options for a gene, like blood groups (A, B, O).

Mutation and Genetic Variation - Mutation: Sudden changes in genetic material, a source of genetic variation. - Types include point mutations and chromosomal mutations. Sex Determination - Mechanisms of sex determination: - XX-XY system in humans. - ZZ-ZW system in birds. - Also includes environmental sex determination in some species. Pedigree Analysis - Used to study inheritance patterns within families. - Autosomal Dominant/Recessive and Sex-linked Traits (X-linked and Y-linked).

Genetics Basics - Genetics: Study of heredity and variations. - Inheritance: Transmission of genetic traits from parents to offspring. -Variation: Differences between individuals of the same species, crucial for evolution. Mendel’s Laws of Inheritance - Law of Dominance: In a heterozygous pair, the dominant allele masks the effect of the recessive allele. - Law of Segregation: During gamete formation, alleles separate so each gamete receives one allele. - Law of Independent Assortment: Genes for different traits are passed independently of each other (valid only if genes are on different chromosomes). Types of Genes and Alleles - Alleles: Different forms of a gene. - Homozygous: Same alleles (e.g., TT or tt). - Heterozygous: Different alleles (e.g., Tt). Genotype and Phenotype - Genotype: Genetic makeup of an organism. - Phenotype: Observable traits or physical expression of the genotype. Chromosomal Theory of Inheritance - Proposed by Sutton and Boveri: States that genes are located on chromosomes, which undergo segregation and independent assortment.

Subject: Biology Topic: coronary arteries A condition of the heart wherein the lipid deposition of plaque in coronary arteries causes a serious disease, known as coronary artery disease. It is also referred to as ischemic heart disease. It causes blockages wherein the artery tends to become narrow and rigid furthermore restricting the smooth blood flow to the heart. The most dangerous factor of this disease is that plaque could rupture leading to heart attack causing sudden cardiac death.