Lesson 10: Heredity: Inheritance and Variation

TSEG

1. Lesson 10: Heredity: Inheritance and Variation Reporters: Sultan, Ibbrahim Gremaldo , Remelyn

2. GENES • A gene is the basic physical and functional unit of heredity. • a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

3. ALLELES • An allele is a specific version of a gene. • One of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.

4. Gregor Mendel • monk studied at University of Vienna • Christian Doppler • garden peas

5. Monohybrid Cross A monohybrid cross is a type of genetic cross that involves tracking the inheritance of a single trait . It’s a fundamental concept in genetics, and understanding it is crucial for comprehending more complex genetic interactions.

6. Dihybrid Cross A dihybrid cross is basically mixing two different traits to see what combinations you get in the offspring.

7. Incomplete Dominance In incomplete dominance, neither gene is completely dominant over the other. Instead of one trait completely masking the other, they blend together to create a new, intermediate trait.

8. Multiple Alleles - means there are many different versions of a gene, leading to more variety in the trait.

9. Pleiotropy and Epistasis - Pleiotropy (one gene can affect multiple traits)
- Epistasis (one gene can mask or modify the expression of another gene)

10. Polygenic Inheritance - polygenic inheritance means many genes work together to create a trait.