Heredity – Class 10 Notes
What is Heredity?
• Heredity is the process by which traits are passed from parents to their children.
• For example: eye colour, hair type, height, skin colour etc.
So, heredity explains why we look similar to our parents.
# Variation
Variation means the differences among individuals of the same species.
Example: Some students are tall, some are short.
#Importance of Variation:
Helps organisms to survive in changing environment
Important for evolution
Increases chances of survival
# Genes
Genes are the units of heredity.
They carry information for a particular trait.
Genes are present on chromosomes inside the nucleus of the cell.
Example:
Gene for height
Gene for eye colour
# Chromosomes
Chromosomes are thread-like structures present in the nucleus.
They carry genes.
Humans have:
23 pairs of chromosomes (46 total)
# Alleles
