Eduqo
General Science›Ch 3: Biology›Genetics and Evolution
Understanding Heredity, DNA, and the Origin of Species
Heredity is the transfer of traits via genes. Mendel's laws and Darwin's natural selection explain how life evolves and adapts over generations.
Memory Hooks
| Law Name | Core Concept | Example |
|---|---|---|
| Dominance | One trait masks another | Tall hides Dwarf |
| Segregation | Alleles separate in gametes | Pure genes transfer |
| Assortment | Traits inherit independently | Color vs Shape |
DNA
(Genetic Material)
Genetic Material
Found in nucleus.
46
(Chromosomes)
Chromosomes
23 pairs total.
Selection
(Darwin's Theory)
Darwin's Theory
Survival of fittest.
Lamarck
(Use / Disuse)
Use / Disuse
Giraffe neck growth.
Mother determines child's sexFather determines child's sex
Father provides either X or Y chromosome.
Humans have 23 chromosomesHumans have 46 chromosomes
It is 23 pairs, making it 46 total.
Darwin gave Use and Disuse theoryLamarck gave Use and Disuse theory
Darwin's theory is Natural Selection.
Q1.Who is known as the 'Father of Genetics'?
Q2.In humans, which chromosome pair determines a male child?