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Genetics, Mendel's Laws of Inheritance & Monohybrid Crosses (WAEC/JAMB) 🧬
SSS 1 - 3Mendelian Genetics and Heredity•Module 1 • Lesson 2•Est. 25 mins
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Section 1 of 3
The Language of Heredity 🧬
### Gregor Mendel: The Father of Modern Genetics!
Mendel experimented with garden peas (*Pisum sativum*) and discovered the laws governing inheritance:
* **Gene**: The unit of heredity located at a specific locus on a chromosome.
* **Allele**: Alternative forms of a gene (e.g., $T$ for tallness, $t$ for shortness).
* **Homozygous**: Having identical alleles ($TT$ or $tt$).
* **Heterozygous**: Having two different alleles ($Tt$).
* **Phenotype**: Physical observable traits (e.g. Tall plant, Albino skin).
* **Genotype**: The internal genetic makeup ($TT, Tt, tt$).
Core Takeaway: Dominant alleles express in both TT and Tt; recessive alleles express only when homozygous (tt).
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Dr. (Mrs.) Adebayo
Senior Secondary & WAEC/JAMB Senior Fellow
Teacher Emeka•12:25 PM
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