Mendel Experiments
Telangana Open School (TOSS) · Class 12 · Biology
Complete topic list for Mendel Experiments in Telangana Open School (TOSS) Class 12 Biology. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Mendel Experiments
Heredity and Variation
- Heredity refers to the transmission of traits from parents to offspring through genes.
- Variation is the difference in traits among individuals of the same species.
- Variations arise due to mutation and recombination during gamete formation.
Mendel's Experiments and Laws of Inheritance
- Mendel used garden pea (Pisum sativum) for his experiments due to its short life cycle, self-pollinating flowers, and distinct contrasting traits.
- He studied seven pairs of contrasting traits including plant height, seed shape, and flower color.
- Monohybrid cross involves one pair of contrasting traits; dihybrid cross involves two pairs.
Additional Genetic Concepts
- Incomplete dominance: Neither allele is completely dominant, resulting in an intermediate phenotype (e.g., pink flowers in 4 o'clock plants).
- Lethal genes cause death when present in homozygous condition.
- Pleiotropy: One gene affects multiple traits.
Human Genetics and Disorders
- Linkage: Genes located close on the same chromosome tend to be inherited together.
- Crossing over during meiosis can separate linked genes, producing new combinations.
- Criss-cross inheritance: Traits like color blindness and hemophilia are X-linked and pass from mother to son.
Key Concepts
Central concept: Mendel's Laws of Inheritance
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